Impact of bio-physical feedbacks on the tropical climate in coupled and uncoupled GCMs SCIE SCOPUS

Cited 23 time in WEB OF SCIENCE Cited 22 time in Scopus
Title
Impact of bio-physical feedbacks on the tropical climate in coupled and uncoupled GCMs
Author(s)
Park, Jong-Yeon; Kug, Jong-Seong; Seo, Hyodae; Bader, Juergen
Publication Year
2014-10
Abstract
The bio-physical feedback process between the marine ecosystem and the tropical climate system is investigated using both an ocean circulation model and a fully-coupled ocean-atmosphere circulation model, which interact with a biogeochemical model. We found that the presence of chlorophyll can have significant impact on the characteristics of the El Nio-Southern Oscillation (ENSO), including its amplitude and asymmetry, as well as on the mean state. That is, chlorophyll generally increases mean sea surface temperature (SST) due to the direct biological heating. However, SST in the eastern equatorial Pacific decreases due to the stronger indirect dynamical response to the biological effects outweighing the direct thermal response. It is demonstrated that this biologically-induced SST cooling is intensified and conveyed to other tropical-ocean basins when atmosphere-ocean coupling is taken into account. It is also found that the presence of chlorophyll affects the magnitude of ENSO by two different mechanisms; one is an amplifying effect by the mean chlorophyll, which is associated with shoaling of the mean thermocline depth, and the other is a damping effect derived from the interactively-varying chlorophyll coupled with the physical model. The atmosphere-ocean coupling reduces the biologically-induced ENSO amplifying effect through the weakening of atmospheric feedback. Lastly, there is also a biological impact on ENSO which enhances the positive skewness. This skewness change is presumably caused by the phase dependency of thermocline feedback which affects the ENSO magnitude.
ISSN
0930-7575
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2699
DOI
10.1007/s00382-013-2009-0
Bibliographic Citation
CLIMATE DYNAMICS, v.43, no.7-8, pp.1811 - 1827, 2014
Publisher
SPRINGER
Subject
SEA-SURFACE TEMPERATURE; UPPER OCEAN TEMPERATURE; PACIFIC WARM POOL; EQUATORIAL PACIFIC; GENERAL-CIRCULATION; PENETRATIVE RADIATION; SOLAR-RADIATION; EASTERN EDGE; EL-NINO; ENSO
Keywords
ENSO; Tropical mean climate; Biological feedback
Type
Article
Language
English
Document Type
Article
Publisher
SPRINGER
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