Imperial College London
Alternate

DrArnaudCzaja

Faculty of Natural Sciences, Department of Physics

Reader in Physical Oceanography
 
 
 
//

Contact

 

+44 (0)20 7594 1789a.czaja Website

 
 
//

Location

 

726Huxley BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Hausmann:2015:10.1175/JCLI-D-15-0015.1,
author = {Hausmann, U and Czaja, A and Marshall, J},
doi = {10.1175/JCLI-D-15-0015.1},
journal = {Journal of Climate},
pages = {439--454},
title = {Estimates of air–sea feedbacks on sea surface temperature anomalies in the southern ocean},
url = {http://dx.doi.org/10.1175/JCLI-D-15-0015.1},
volume = {29},
year = {2015}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Sea surface temperature (SST) air–sea feedback strengths and associated decay time scales in the Southern Ocean (SO) are estimated from observations and reanalysis datasets of SST, air–sea heat fluxes, and ocean mixed layer depths. The spatial, seasonal, and scale dependence of the air–sea heat flux feedbacks is mapped in circumpolar bands and implications for SST persistence times are explored. It is found that the damping effect of turbulent heat fluxes dominates over that due to radiative heat fluxes. The turbulent heat flux feedback acts to damp SSTs in all bands and spatial scales and in all seasons, at rates varying between 5 and 25 W m−2 K−1, while the radiative heat flux feedback has a more uniform spatial distribution with a magnitude rarely exceeding 5 W m−2 K−1. In particular, the implied net air–sea feedback (turbulent + radiative) on SST south of the polar front, and in the region of seasonal sea ice, is as weak as 5–10 W m−2 K−1 in the summertime on large spatial scales. Air–sea interaction alone thus allows SST signals induced around Antarctica in the summertime to persist for several seasons. The damping effect of mixed layer entrainment on SST anomalies averages to approximately 20 W m−2 K−1 across the ACC bands in the summer-to-winter entraining season and thereby reduces summertime SST persistence to less than half of that predicted by air–sea interaction alone (i.e., 3–6 months).
AU  - Hausmann,U
AU  - Czaja,A
AU  - Marshall,J
DO  - 10.1175/JCLI-D-15-0015.1
EP  - 454
PY  - 2015///
SN  - 1520-0442
SP  - 439
TI  - Estimates of air–sea feedbacks on sea surface temperature anomalies in the southern ocean
T2  - Journal of Climate
UR  - http://dx.doi.org/10.1175/JCLI-D-15-0015.1
UR  - http://hdl.handle.net/10044/1/32474
VL  - 29
ER  -
Download