09 Jan 2023
 | 09 Jan 2023
Status: this preprint is open for discussion and under review for Climate of the Past (CP).

Warm tropical oceans and ENSO flavours behind the late Holocene change in hydroclimates in northern South America

Juan Mauricio Bedoya, Maria I. Velez, and German Poveda

Abstract. At about 4,000 years ago the earth’s global climate underwent significant transformations resulting from changes in solar insolation. Manifestations of this change are relatively well known in higher latitudes, however, in the American tropics these are still not fully identified or understood. Recent paleo-environmental reconstructions based on paleolimnological and vegetational histories of two Colombian Andean sites suggest that between ~4,150 and 2,500 yr BP the Eastern Cordillera (EC) witness wetter anomalies, while the Western Cordillera (WC) suffered from drier anomalies between ~3,700 and 1,750 yr BP. Results from analyses of modern precipitation series from weather stations close to the study sites indicate that the long-term mean annual cycle of precipitation in both sites is out-of-phase and that precipitation anomalies on the western (eastern) site are negatively (positively) correlated with sea surface temperatures in the tropical Pacific (Tropical Atlantic). Hence that we propose that both oceans warmed up during the late Holocene, likely from a more active ENSO and ENSO flavours. With the current global rise in atmospheric temperature and the warming of tropical oceans, this study sheds light on possible anomalous effects on precipitation over the northern Andes.

Juan Mauricio Bedoya et al.

Status: open (until 06 Jul 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1428', Anonymous Referee #1, 07 Apr 2023 reply
    • AC1: 'Reply on RC1', Maria Velez, 21 Apr 2023 reply

Juan Mauricio Bedoya et al.

Juan Mauricio Bedoya et al.


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Short summary
At 4 kyr Before Present there was a change in the overall climate of the Earth caused by orbital forcing. Recent paleoclimatic reconstructions from two sites in the Eastern and Western Andes of Colombia show that at ~4 kyr there was less (more) precipitation in the Western (Eastern) sites. Modern hydroclimate analyses indicate that the out of phase precipitation is caused by warming in the Tropical Pacific (Atlantic). We propose that this warming is due to ENSO flavours.