Insignificant but robust decrease of ENSO predictability in an equilibrium warmer climate

Zheng, Yiyu; Rugenstein, Maria; Pieper, Patrick; Beobide-Arsuaga, Goratz; Baehr, Johanna

doi:https://doi.org/10.5194/egusphere-2022-89

Preprints

https://doi.org/10.5194/egusphere-2022-89

Preprints

28 Mar 2022

| 28 Mar 2022

Insignificant but robust decrease of ENSO predictability in an equilibrium warmer climate

Yiyu Zheng, Maria Rugenstein, Patrick Pieper, Goratz Beobide-Arsuaga, and Johanna Baehr

Abstract. Responses of El Niño-Southern Oscillation (ENSO) to global warming remain uncertain, which challenges ENSO forecasts in a warming climate. We investigate changes in ENSO characteristics and predictability in idealized simulations with quadrupled CO₂ forcing from seven general circulation models. Comparing the warmer climate to control simulations, ENSO variability weakens, with the neutral state lasts longer, while active ENSO states last shorter and skew to favor the La Niña state. Six-month persistence-assessed ENSO predictability slightly reduces in five models and increases in two models under the warming condition. While the overall changes in ENSO predictability are insignificant, we find significant relationships between changes in predictability and intensity, duration and skewness of the three individual ENSO states. The maximal contribution to changes in the predictability of El Niño, La Niña and neutral states stems from changes in skewness and events' duration. Our findings show that a robust and significant decrease in ENSO characteristics does not imply a similar change in ENSO predictability in a warmer climate. This could be due to model deficiencies in ENSO dynamics and limitations in persistence model when predicting ENSO.

Received: 22 Mar 2022 – Discussion started: 28 Mar 2022

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Journal article(s) based on this preprint

17 Nov 2022

El Niño–Southern Oscillation (ENSO) predictability in equilibrated warmer climates

Yiyu Zheng, Maria Rugenstein, Patrick Pieper, Goratz Beobide-Arsuaga, and Johanna Baehr

Earth Syst. Dynam., 13, 1611–1623, https://doi.org/10.5194/esd-13-1611-2022,https://doi.org/10.5194/esd-13-1611-2022, 2022

Short summary

Yiyu Zheng et al.

Interactive discussion

Status: closed

RC1:
'Comment on egusphere-2022-89', Anonymous Referee #1, 31 May 2022

The study titled" Insignificant but robust decrease of ENSO predictability in an equilibrium warmer climate" investigates ENSO characteristics and predictability in a warmer climate. It is a novel work which furthers the understanding of ENSO predictability in the future. It can be accepted after the following comments are addressed:

Line 55: The authors should explain LongRunMIP in detail.

Line 250: The authors claim that "ENSO mean characteristics significantly change in a warmer climate.". Can the authors verify this with the paleoclimate research on ENSO when the Earth's temperature was warmer than the present day? Support from proxy records would justify the analysis considering the biases in the models.

The authors discuss about the ENSO predictability, however, there is no mention of forcings which can make the ENSO more predictable such as volcanoes. Recent studies such as Khodri et al 2017, Singh et al 2020 etc have shown that strong volcanic eruptions can trigger El Ninos.

Khodri, M., Izumo, T., Vialard, J., Janicot, S., Cassou, C., Lengaigne, M., Mignot, J., Gastineau, G., Guilyardi, E., Lebas, N. and Robock, A., 2017. Tropical explosive volcanic eruptions can trigger El Niño by cooling tropical Africa. Nature communications, 8(1), pp.1-13.

Singh, M., Krishnan, R., Goswami, B., Choudhury, A.D., Swapna, P., Vellore, R., Prajeesh, A.G., Sandeep, N., Venkataraman, C., Donner, R.V. and Marwan, N., 2020. Fingerprint of volcanic forcing on the ENSO–Indian monsoon coupling. Science advances, 6(38), p.eaba8164.

Citation: https://doi.org/10.5194/egusphere-2022-89-RC1
- AC1: 'Reply on RC1', Yiyu Zheng, 25 Aug 2022
  
  The study titled" Insignificant but robust decrease of ENSO predictability in an equilibrium warmer climate" investigates ENSO characteristics and predictability in a warmer climate. It is a novel work which furthers the understanding of ENSO predictability in the future. It can be accepted after the following comments are addressed:
  We thank the reviewer for their time, effort, and constructive comments. We have added a) a detailed explanation on LongRunMIP; b) a comparison of our results to proxy records; c) a discussion about volcanoes' impact on ENSO predictability.
  -----------------------------------------------------------------------------------
  Line 55: The authors should explain LongRunMIP in detail.
  We apologize for the oversimplification. The explanation is added at Line 56, and the first paragraph of Section 2 becomes:
  We analyze model outputs from the LongRunMIP archive, a large set of simulations from atmosphere-ocean general circulation models that last at least 1000 years (Rugenstein et al., 2019). This archive includes 15 models, each contains a pre-industrial control simulation of constant 1850-forcing and at least one forced simulation, ranging from instantaneous steps of two-, four-, eight-, or sixteen-time CO₂ to realistic Representative Concentration Pathway (RCP) scenarios with constant forcing beyond year 2300. We select seven models from the archive with abrupt quadrupling CO₂ simulations (hereinafter referred to as abrupt4xCO₂) and compare them with their pre-industrial control simulations (hereinafter referred to as control). This forcing level is chosen because it shows a better signal-to-noise ratio than the doubling of CO₂. The spatial resolution of these seven models ranges from 3.75° in both the atmosphere and ocean to 1.4° in the atmosphere and 0.8° in the ocean. Though models with different resolutions might show different ENSO dynamics, our results on ENSO response are robust and independent of model resolution. We treat the period between year 150 and the end of the simulation as……
  -----------------------------------------------------------------------------------
  Line 250: The authors claim that "ENSO mean characteristics significantly change in a warmer climate.". Can the authors verify this with the paleoclimate research on ENSO when the Earth's temperature was warmer than the present day? Support from proxy records would justify the analysis considering the biases in the models.
  We add it to Line 256 and the second paragraph in Section 4 becomes:
  The weakening in ENSO characteristics can be seen in both ultra-high-resolution models and proxy records. Wengel et al. (2022) showed a decreased ENSO amplitude in a model with 0.25° atmospheric resolution, which is both qualitatively and quantitatively consistent with our results (compare their Fig. 4a with our Fig.6a). White and Ravelo (2020) showed a reduced El Niño amplitude in the early Pliocene, during which the climate resembles closely the one projected in RCP4.5 scenario (Burke et al., 2018).
  From the robust response of ENSO characteristics under abrupt4xCO₂ forcing, we would expect ….
  -----------------------------------------------------------------------------------
  The authors discuss about the ENSO predictability, however, there is no mention of forcings which can make the ENSO more predictable such as volcanoes. Recent studies such as Khodri et al 2017, Singh et al 2020 etc have shown that strong volcanic eruptions can trigger El Ninos.
  Khodri, M., Izumo, T., Vialard, J., Janicot, S., Cassou, C., Lengaigne, M., Mignot, J., Gastineau, G., Guilyardi, E., Lebas, N. and Robock, A., 2017. Tropical explosive volcanic eruptions can trigger El Niño by cooling tropical Africa. Nature communications, 8(1), pp.1-13.
  Singh, M., Krishnan, R., Goswami, B., Choudhury, A.D., Swapna, P., Vellore, R., Prajeesh, A.G., Sandeep, N., Venkataraman, C., Donner, R.V. and Marwan, N., 2020. Fingerprint of volcanic forcing on the ENSO–Indian monsoon coupling. Science advances, 6(38), p.eaba8164.
  The suggested paper and a short discussion of the relevance of volcanoes now included in Line 280:
  Aside from changes in ENSO characteristics studied here, other factors influence ENSO predictability: ENSO phase-locking (e.g. Jin and Kinter III, 2009), the Atlantic Niño (e.g. Martín-Rey et al., 2015), the Pacific Decadal Oscillation (e.g. Kumar et al., 2013), and volcanic eruptions (e.g. Khodri et al., 2017; Singh et al., 2020).
  
  Citation: https://doi.org/10.5194/egusphere-2022-89-AC1
RC2:
'Comment on egusphere-2022-89', Anonymous Referee #2, 07 Aug 2022

In this manuscript the authors have examined the predictability of ENSO in coupled ocean-atmosphere models whose simualtions are more than 1000 years long. Many of the conclusions about the changes in ENSO charateristics is well-known based on previous work in this area. The main advantage of this work is their ability to look at a much longer simualtion and hence differentiate between transinet and equlibirum response. The authors have not discussed the role of spatial resolution on the simualtion of ENSO. This is important since a recent work by Wengel et al, Nature Climate Change ,2022 "Future high-resolution El Niño/Southern Oscillation dynamics" has claimed that the resolution of mesoscale processes is important to simulate the robust weakening of ENSO with global warming. Hence there is a need to add some discussion about this paper and convince the readers that the results reported in the manuscript are not sensitive to spatial resolution

Citation: https://doi.org/10.5194/egusphere-2022-89-RC2
- AC2: 'Reply on RC2', Yiyu Zheng, 25 Aug 2022
  
  In this manuscript the authors have examined the predictability of ENSO in coupled ocean-atmosphere models whose simualtions are more than 1000 years long. Many of the conclusions about the changes in ENSO charateristics is wellknown based on previous work in this area. The main advantage of this work is their ability to look at a much longer simualtion and hence differentiate between transinet and equlibirum response. The authors have not discussed the role of spatial resolution on the simualtion of ENSO. This is important since a recent work by Wengel et al, Nature Climate Change ,2022 "Future high-resolution El Niño/Southern Oscillation dynamics" has claimed that the resolution of mesoscale processes is important to simulate the robust weakening of ENSO with global warming. Hence there is a need to add some discussion about this paper and convince the readers that the results reported in the manuscript are not sensitive to spatial resolution
  We thank the reviewer's time and valuable comments on our results' sensitivity to model resolution. We add to both Line 59 and Line 256, now the first paragraph in Section 2 and the second paragraph in Section 4 become:
  We analyze model outputs from the LongRunMIP archive, a large set of simulations from atmosphere-ocean general circulation models that last at least 1000 years (Rugenstein et al., 2019). This archive includes 15 models, each contains a pre-industrial control simulation of constant 1850-forcing and at least one forced simulation, ranging from instantaneous steps of two-, four-, eight-, or sixteen-time CO₂ to realistic Representative Concentration Pathway (RCP) scenarios with constant forcing beyond year 2300. We select seven models from the archive with abrupt quadrupling CO₂ simulations (hereinafter referred to as abrupt4xCO₂) and compare them with their pre-industrial control simulations (hereinafter referred to as control). This forcing level is chosen because it shows a better signal-to-noise ratio than the doubling of CO₂. The spatial resolution of these seven models ranges from 3.75° in both the atmosphere and ocean to 1.4° in the atmosphere and 0.8° in the ocean. Though models with different resolutions might show different ENSO dynamics, our results on ENSO response are robust among the models. We treat the period between year 150 and the end of the simulation as……
  The weakening in ENSO characteristics can be seen in both ultra-high-resolution models and proxy records. Wengel et al. (2022) showed a decreased ENSO amplitude in a model with 0.25° atmospheric resolution, which is both qualitatively and quantitatively consistent with our results (compare their Fig. 4a with our Fig.6a). White and Ravelo (2020) showed a reduced El Niño amplitude during early Pliocene, during which the climate resembles closely the one projected in RCP4.5 scenario (Burke et al., 2018).
  From the robust response of ENSO characteristics under abrupt4xCO₂ forcing, we would expect ….
  
  Citation: https://doi.org/10.5194/egusphere-2022-89-AC2
AC3: 'Comment on egusphere-2022-89', Yiyu Zheng, 25 Aug 2022

We realize a potential confusion people may have towards our title, which is the use of words "insignificant" and "robust". In order to avoid different interpretations of our results from the title, we would like to change the title to "Changes in ENSO Predictability in an Equilibrium Warmer Climate".

Citation: https://doi.org/10.5194/egusphere-2022-89-AC3

Interactive discussion

Status: closed

RC1:
'Comment on egusphere-2022-89', Anonymous Referee #1, 31 May 2022

The study titled" Insignificant but robust decrease of ENSO predictability in an equilibrium warmer climate" investigates ENSO characteristics and predictability in a warmer climate. It is a novel work which furthers the understanding of ENSO predictability in the future. It can be accepted after the following comments are addressed:

Line 55: The authors should explain LongRunMIP in detail.

Line 250: The authors claim that "ENSO mean characteristics significantly change in a warmer climate.". Can the authors verify this with the paleoclimate research on ENSO when the Earth's temperature was warmer than the present day? Support from proxy records would justify the analysis considering the biases in the models.

The authors discuss about the ENSO predictability, however, there is no mention of forcings which can make the ENSO more predictable such as volcanoes. Recent studies such as Khodri et al 2017, Singh et al 2020 etc have shown that strong volcanic eruptions can trigger El Ninos.

Khodri, M., Izumo, T., Vialard, J., Janicot, S., Cassou, C., Lengaigne, M., Mignot, J., Gastineau, G., Guilyardi, E., Lebas, N. and Robock, A., 2017. Tropical explosive volcanic eruptions can trigger El Niño by cooling tropical Africa. Nature communications, 8(1), pp.1-13.

Singh, M., Krishnan, R., Goswami, B., Choudhury, A.D., Swapna, P., Vellore, R., Prajeesh, A.G., Sandeep, N., Venkataraman, C., Donner, R.V. and Marwan, N., 2020. Fingerprint of volcanic forcing on the ENSO–Indian monsoon coupling. Science advances, 6(38), p.eaba8164.

Citation: https://doi.org/10.5194/egusphere-2022-89-RC1
- AC1: 'Reply on RC1', Yiyu Zheng, 25 Aug 2022
  
  The study titled" Insignificant but robust decrease of ENSO predictability in an equilibrium warmer climate" investigates ENSO characteristics and predictability in a warmer climate. It is a novel work which furthers the understanding of ENSO predictability in the future. It can be accepted after the following comments are addressed:
  We thank the reviewer for their time, effort, and constructive comments. We have added a) a detailed explanation on LongRunMIP; b) a comparison of our results to proxy records; c) a discussion about volcanoes' impact on ENSO predictability.
  -----------------------------------------------------------------------------------
  Line 55: The authors should explain LongRunMIP in detail.
  We apologize for the oversimplification. The explanation is added at Line 56, and the first paragraph of Section 2 becomes:
  We analyze model outputs from the LongRunMIP archive, a large set of simulations from atmosphere-ocean general circulation models that last at least 1000 years (Rugenstein et al., 2019). This archive includes 15 models, each contains a pre-industrial control simulation of constant 1850-forcing and at least one forced simulation, ranging from instantaneous steps of two-, four-, eight-, or sixteen-time CO₂ to realistic Representative Concentration Pathway (RCP) scenarios with constant forcing beyond year 2300. We select seven models from the archive with abrupt quadrupling CO₂ simulations (hereinafter referred to as abrupt4xCO₂) and compare them with their pre-industrial control simulations (hereinafter referred to as control). This forcing level is chosen because it shows a better signal-to-noise ratio than the doubling of CO₂. The spatial resolution of these seven models ranges from 3.75° in both the atmosphere and ocean to 1.4° in the atmosphere and 0.8° in the ocean. Though models with different resolutions might show different ENSO dynamics, our results on ENSO response are robust and independent of model resolution. We treat the period between year 150 and the end of the simulation as……
  -----------------------------------------------------------------------------------
  Line 250: The authors claim that "ENSO mean characteristics significantly change in a warmer climate.". Can the authors verify this with the paleoclimate research on ENSO when the Earth's temperature was warmer than the present day? Support from proxy records would justify the analysis considering the biases in the models.
  We add it to Line 256 and the second paragraph in Section 4 becomes:
  The weakening in ENSO characteristics can be seen in both ultra-high-resolution models and proxy records. Wengel et al. (2022) showed a decreased ENSO amplitude in a model with 0.25° atmospheric resolution, which is both qualitatively and quantitatively consistent with our results (compare their Fig. 4a with our Fig.6a). White and Ravelo (2020) showed a reduced El Niño amplitude in the early Pliocene, during which the climate resembles closely the one projected in RCP4.5 scenario (Burke et al., 2018).
  From the robust response of ENSO characteristics under abrupt4xCO₂ forcing, we would expect ….
  -----------------------------------------------------------------------------------
  The authors discuss about the ENSO predictability, however, there is no mention of forcings which can make the ENSO more predictable such as volcanoes. Recent studies such as Khodri et al 2017, Singh et al 2020 etc have shown that strong volcanic eruptions can trigger El Ninos.
  Khodri, M., Izumo, T., Vialard, J., Janicot, S., Cassou, C., Lengaigne, M., Mignot, J., Gastineau, G., Guilyardi, E., Lebas, N. and Robock, A., 2017. Tropical explosive volcanic eruptions can trigger El Niño by cooling tropical Africa. Nature communications, 8(1), pp.1-13.
  Singh, M., Krishnan, R., Goswami, B., Choudhury, A.D., Swapna, P., Vellore, R., Prajeesh, A.G., Sandeep, N., Venkataraman, C., Donner, R.V. and Marwan, N., 2020. Fingerprint of volcanic forcing on the ENSO–Indian monsoon coupling. Science advances, 6(38), p.eaba8164.
  The suggested paper and a short discussion of the relevance of volcanoes now included in Line 280:
  Aside from changes in ENSO characteristics studied here, other factors influence ENSO predictability: ENSO phase-locking (e.g. Jin and Kinter III, 2009), the Atlantic Niño (e.g. Martín-Rey et al., 2015), the Pacific Decadal Oscillation (e.g. Kumar et al., 2013), and volcanic eruptions (e.g. Khodri et al., 2017; Singh et al., 2020).
  
  Citation: https://doi.org/10.5194/egusphere-2022-89-AC1
RC2:
'Comment on egusphere-2022-89', Anonymous Referee #2, 07 Aug 2022

In this manuscript the authors have examined the predictability of ENSO in coupled ocean-atmosphere models whose simualtions are more than 1000 years long. Many of the conclusions about the changes in ENSO charateristics is well-known based on previous work in this area. The main advantage of this work is their ability to look at a much longer simualtion and hence differentiate between transinet and equlibirum response. The authors have not discussed the role of spatial resolution on the simualtion of ENSO. This is important since a recent work by Wengel et al, Nature Climate Change ,2022 "Future high-resolution El Niño/Southern Oscillation dynamics" has claimed that the resolution of mesoscale processes is important to simulate the robust weakening of ENSO with global warming. Hence there is a need to add some discussion about this paper and convince the readers that the results reported in the manuscript are not sensitive to spatial resolution

Citation: https://doi.org/10.5194/egusphere-2022-89-RC2
- AC2: 'Reply on RC2', Yiyu Zheng, 25 Aug 2022
  
  In this manuscript the authors have examined the predictability of ENSO in coupled ocean-atmosphere models whose simualtions are more than 1000 years long. Many of the conclusions about the changes in ENSO charateristics is wellknown based on previous work in this area. The main advantage of this work is their ability to look at a much longer simualtion and hence differentiate between transinet and equlibirum response. The authors have not discussed the role of spatial resolution on the simualtion of ENSO. This is important since a recent work by Wengel et al, Nature Climate Change ,2022 "Future high-resolution El Niño/Southern Oscillation dynamics" has claimed that the resolution of mesoscale processes is important to simulate the robust weakening of ENSO with global warming. Hence there is a need to add some discussion about this paper and convince the readers that the results reported in the manuscript are not sensitive to spatial resolution
  We thank the reviewer's time and valuable comments on our results' sensitivity to model resolution. We add to both Line 59 and Line 256, now the first paragraph in Section 2 and the second paragraph in Section 4 become:
  We analyze model outputs from the LongRunMIP archive, a large set of simulations from atmosphere-ocean general circulation models that last at least 1000 years (Rugenstein et al., 2019). This archive includes 15 models, each contains a pre-industrial control simulation of constant 1850-forcing and at least one forced simulation, ranging from instantaneous steps of two-, four-, eight-, or sixteen-time CO₂ to realistic Representative Concentration Pathway (RCP) scenarios with constant forcing beyond year 2300. We select seven models from the archive with abrupt quadrupling CO₂ simulations (hereinafter referred to as abrupt4xCO₂) and compare them with their pre-industrial control simulations (hereinafter referred to as control). This forcing level is chosen because it shows a better signal-to-noise ratio than the doubling of CO₂. The spatial resolution of these seven models ranges from 3.75° in both the atmosphere and ocean to 1.4° in the atmosphere and 0.8° in the ocean. Though models with different resolutions might show different ENSO dynamics, our results on ENSO response are robust among the models. We treat the period between year 150 and the end of the simulation as……
  The weakening in ENSO characteristics can be seen in both ultra-high-resolution models and proxy records. Wengel et al. (2022) showed a decreased ENSO amplitude in a model with 0.25° atmospheric resolution, which is both qualitatively and quantitatively consistent with our results (compare their Fig. 4a with our Fig.6a). White and Ravelo (2020) showed a reduced El Niño amplitude during early Pliocene, during which the climate resembles closely the one projected in RCP4.5 scenario (Burke et al., 2018).
  From the robust response of ENSO characteristics under abrupt4xCO₂ forcing, we would expect ….
  
  Citation: https://doi.org/10.5194/egusphere-2022-89-AC2
AC3: 'Comment on egusphere-2022-89', Yiyu Zheng, 25 Aug 2022

We realize a potential confusion people may have towards our title, which is the use of words "insignificant" and "robust". In order to avoid different interpretations of our results from the title, we would like to change the title to "Changes in ENSO Predictability in an Equilibrium Warmer Climate".

Citation: https://doi.org/10.5194/egusphere-2022-89-AC3

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload

ED: Reconsider after major revisions (29 Aug 2022) by Anders Levermann

AR by Yiyu Zheng on behalf of the Authors (02 Sep 2022) Author's response Author's tracked changes Manuscript

ED: Referee Nomination & Report Request started (13 Sep 2022) by Anders Levermann

ED: Publish as is (24 Oct 2022) by Anders Levermann

AR by Yiyu Zheng on behalf of the Authors (27 Oct 2022) Manuscript

Journal article(s) based on this preprint

17 Nov 2022

El Niño–Southern Oscillation (ENSO) predictability in equilibrated warmer climates

Yiyu Zheng, Maria Rugenstein, Patrick Pieper, Goratz Beobide-Arsuaga, and Johanna Baehr

Earth Syst. Dynam., 13, 1611–1623, https://doi.org/10.5194/esd-13-1611-2022,https://doi.org/10.5194/esd-13-1611-2022, 2022

Short summary

Yiyu Zheng et al.

Data sets

Dataset associated with "Insignificant but robust decrease of ENSO predictability in an equilibrium warmer climate" Zheng, Yiyu; Rugenstein, Maria; Pieper, Patrick; Beobide-Arsuaga, Goratz; Baehr, Johanna http://dx.doi.org/10.25675/10217/234545

Yiyu Zheng et al.

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ENSO is one of the dominant climatic phenomena in the equatorial Pacific. Understanding and predicting how ENSO might change in a warmer climate is both societally and scientifically important. We use thousand-year-long simulations from seven climate models to analyze ENSO in an idealized stable climate. We show that ENSO will be weaker and last shorter under the warming, while the skill of ENSO prediction will unlikely to change.


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