13 May 2022
13 May 2022
Status: this preprint is open for discussion.

Interactive Biogenic Emissions and Drought Stress Effects on Atmospheric Composition in NASA GISS ModelE

Elizabeth Renee Klovenski1, Yuxuan Wang1, Susanne Elizabeth Bauer2, Kostas Tsigaridis2,3, Greg Faluvegi2,3, Igor Aleinov2,3, Nancy Y. Kiang2, Alex Guenther4, Xiaoyan Jiang4, Wei Li1, and Nan Lin5 Elizabeth Renee Klovenski et al.
  • 1Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA
  • 2NASA Goddard Institute for Space Studies, New York, NY, USA
  • 3Center for Climate Systems Research, Columbia University, New York, NYC, USA
  • 4Department of Earth System Science, University of California – Irvine, Irvine, CA, USA
  • 5Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China

Abstract. Drought is a hydroclimatic extreme that causes perturbations to the terrestrial biosphere, and acts as a stressor on vegetation, affecting emissions patterns. During severe drought, isoprene emissions are reduced. In this paper, we focus on capturing this reduction signal by implementing a new percentile isoprene drought stress (yd) algorithm in NASA GISS ModelE based on the MEGAN3 (Model of Emissions of Gases and Aerosols from Nature Version 3) approach as a function of a photosynthetic parameter (Vc,max) and water stress (β) . Four global transient simulations from 2003–2013 are used to demonstrate the effect without yd (Default_ModelE) and with online yd (DroughtStress_ModelE). DroughtStress_ModelE is evaluated against the observed isoprene measurements at the Missouri Ozarks Ameriflux (MOFLUX) site during the 2012 severe drought where improvements in correlation coefficient indicate it is a suitable drought stress parameterization to capture the reduction signal during severe drought. The application of yd globally leads to a decadal average reduction of ~2.7 % which is equivalent to ~14.6 Tg yr-1 of isoprene. The changes have larger impacts in regions such as the Southeast U.S.. DroughtStress_ModelE is validated using satellite ΩHCHO column from the Ozone Monitoring Instrument (OMI) and surface O3 observations across regions of the U.S. to examine the effect of drought on atmospheric composition. It was found the inclusion of isoprene drought stress reduced the overestimation of ΩHCHO in Default_ModelE during the 2007 and 2011 southeastern U.S. droughts and lead to improvements in simulated O3 during drought periods. We conclude that isoprene drought stress should be tuned on a model-by-model basis, because the variables used in the parameterization responses are relative to the land surface model hydrology scheme (LSM) and the effects of yd application could be larger than seen here due to ModelE not having large biases of isoprene during severe drought.

Elizabeth Renee Klovenski et al.

Status: open (until 24 Jun 2022)

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Elizabeth Renee Klovenski et al.

Elizabeth Renee Klovenski et al.


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Short summary
Severe drought stresses vegetation and causes reduced emission of isoprene. We study the impact of including a new isoprene drought stress (yd) parameterization into NASA GISS ModelE called (DroughtStress_ModelE), which is specifically tuned for ModelE. Inclusion of yd leads to better simulated isoprene emissions at the MOFLUX site during the severe drought of 2012, reduced overestimation of OMI satellite ΩHCHO (formaldehyde column) and improved simulated O3 (ozone) during drought.