Hadley Circulation Decadal Variability Impact on the Andes Precipitation over the Last 1500 years: IPSL-CM6A-LR model perspective.
Abstract
The simulations of the historical period reveal a dominant effect of the external forcing on the Hadley Cell (HC) expansion and its negative impact on the central Andes precipitation over the last decades. They also show a secondary but significant relationship with the decadal-to-multidecadal internal variability of the Pacific sea surface temperature (SST). The climate system has been largely conditioned by the emerging anthropogenic forcing effects during the last decades of the historical period. Hence, the historical simulations may not be the most appropriate ones to constrain the internal climate variability at such long time scales. Instead we use the IPSL-CM6A-LR models covering the last 1500 years (500AD to Present Day) to study the influence of the internal SST variability and external forcing on changes of the HC extent at decadal-to-multi-decadal time scales and their impacts on precipitation in central Andes.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMGC43E1446V
- Keywords:
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- 0473 Paleoclimatology and paleoceanography;
- BIOGEOSCIENCES;
- 0476 Plant ecology;
- BIOGEOSCIENCES;
- 1616 Climate variability;
- GLOBAL CHANGE;
- 1630 Impacts of global change;
- GLOBAL CHANGE