The Barrier Layer of the Atlantic warm pool: Formation mechanism and influence on the mean climate SCIE SCOPUS

Cited 28 time in WEB OF SCIENCE Cited 0 time in Scopus
Title
The Barrier Layer of the Atlantic warm pool: Formation mechanism and influence on the mean climate
Author(s)
Balaguru, K.; Chang, P.; Saravanan, R.; Jang, C. J.
KIOST Author(s)
Jang, Chan Joo(장찬주)
Publication Year
2012
Abstract
Many coupled general circulation models (CGCMs) tend to overestimate the salinity in the Atlantic warm pool or the Northwestern Tropical Atlantic (NWTA) and underestimate the surface salinity in the subtropical salinity maxima region. Most of these models also suffer from a sea-surface temperature (SST) bias in the NWTA region, leading to suggestions that the upper ocean salinity stratification may need to be improved in order to improve the barrier layer (BL) simulations and thus the SST through BL-SST-intertropical convergence zone feedbacks. In the present study, we use a CGCM to perform a set of idealised numerical experiments to test and understand the sensitivity of the BL and consequently SST in the NWTA region to freshwater flux and hence the upper ocean salinity stratification. We find that the BL of the NWTA is sensitive to upper ocean salinity changes in the Amazon river discharge region and the subtropical salinity maxima region. The BL phenomenon is further manifested by the formation of winter temperature inversions in our model simulations, the maximum magnitude of inversions being about 0.2 degrees C. The atmospheric response causes a statistically significant reduction of mean precipitation and SST in the equatorial Atlantic region and helps improve the respective biases by 10-15%. In the region of improved BL simulation, the SST change is positive and in the right direction of bias correction, albeit weak.
ISSN
0280-6495
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3748
DOI
10.3402/tellusa.v64i0.18162
Bibliographic Citation
TELLUS SERIES A-DYNAMIC METEOROLOGY AND OCEANOGRAPHY, v.64, 2012
Publisher
CO-ACTION PUBLISHING
Subject
OCEAN-ATMOSPHERE MODEL; TROPICAL ATLANTIC; MIXED-LAYER; EL-NINO; SYSTEM MODEL; PACIFIC; SALINITY; AMAZON; SEA; PRECIPITATION
Keywords
barrier layer; upper ocean salinity; temperature inversions; Atlantic climate; Amazon river discharge
Type
Article
Language
English
Document Type
Article
Publisher
CO-ACTION PUBLISHING
Related Researcher
Research Interests

upper ocean dynamics,regional climate modeling,ocean climate change,해양상층역학,지역기후모델링,해양기후변화

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse