Mechanisms controlling the SST air-sea heat flux feedback and its dependence on spatial scale
MetadataShow full item record
KeywordSea surface temperature; Air-sea interaction; Feedback; Variability; Southern Ocean; North Atlantic
The turbulent air-sea heat flux feedback (α, in W m-2 K-1) is a major contributor to setting the damping timescale of sea surface temperature (SST) anomalies. In this study we compare the spatial distribution and magnitude of α in the North Atlantic and the Southern Ocean, as estimated from the ERA-Interim reanalysis dataset. The comparison is rationalized in terms of an upper bound on the heat flux feedback, associated with \fast" atmospheric export of temperature and moisture anomalies away from the marine boundary layer, and a lower bound associated with "slow" export. It is found that regions of cold surface waters (≤10°C) are best described as approaching the slow export limit. This conclusion is not only valid at the synoptic scale resolved by the reanalysis data, but also on basin scales. In particular, it applies to the heat flux feedback acting as circumpolar SST anomaly scales are approached in the Southern Ocean, with feedbacks of ≤10 W m-2 K-1. In contrast, the magnitude of the heat flux feed-back is close to that expected from the fast export limit over the Gulf Stream and its recirculation with values on the order of ≈40 W m-2 K-1. Further analysis suggests that this high value reflects a compensation between a moderate thermo-dynamic adjustment of the boundary layer, which tends to weaken the heat flux feedback, and an enhancement of the surface winds over warm SST anomalies, which tend to enhance the feedback.
Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Climate Dynamics 48 (2017): 1297–1307, doi:10.1007/s00382-016-3142-3.
Suggested CitationPreprint: Hausmann, Ute, Czaja, Arnaud, Marshall, John, "Mechanisms controlling the SST air-sea heat flux feedback and its dependence on spatial scale", 2016-04-05, https://doi.org/10.1007/s00382-016-3142-3, https://hdl.handle.net/1912/8853
Showing items related by title, author, creator and subject.
Pullen, Julie; Doyle, James D.; Haack, Tracy; Dorman, Clive E.; Signell, Richard P.; Lee, Craig M. (American Geophysical Union, 2007-02-13)A two-way interacting high resolution numerical simulation of the Adriatic Sea using the Navy Coastal Ocean Model (NCOM) and Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS®) was conducted to improve forecast ...
Friedlingstein, Pierre; Cox, P.; Betts, Richard A.; Bopp, Laurent; von Bloh, W.; Brovkin, V.; Cadule, P.; Doney, Scott C.; Eby, Michael; Fung, Inez Y.; Bala, G.; John, Jasmin G.; Jones, C. D.; Joos, Fortunat; Kato, T.; Kawamiya, M.; Knorr, W.; Lindsay, Keith; Matthews, H. D.; Raddatz, T.; Rayner, Peter; Reick, C.; Roeckner, E.; Schnitzler, K.-G.; Schnur, R.; Strassmann, K.; Weaver, Andrew J.; Yoshikawa, C.; Zeng, Ning (American Meteorological Society, 2006-07-15)Eleven coupled climate–carbon cycle models used a common protocol to study the coupling between climate change and the carbon cycle. The models were forced by historical emissions and the Intergovernmental Panel on Climate ...
Randerson, James T.; Lindsay, Keith; Munoz, E.; Fu, W.; Moore, J. Keith; Hoffman, Forrest M.; Mahowald, Natalie M.; Doney, Scott C. (John Wiley & Sons, 2015-06-02)Improved constraints on carbon cycle responses to climate change are needed to inform mitigation policy, yet our understanding of how these responses may evolve after 2100 remains highly uncertain. Using the Community Earth ...