Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgrc..108.3248w&link_type=abstract
Journal of Geophysical Research, Volume 108, Issue C8, pp. 4-1, CiteID 3248, DOI 10.1029/2002JC001396
Astronomy and Astrophysics
Astrophysics
16
Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions (0312, 4504), Oceanography: Physical: Upper Ocean Processes, Solar Physics, Astrophysics, And Astronomy: Solar Activity Cycle (2162), Global Change: Climate Dynamics (3309)
Scientific paper
Recent studies find global climate variability in the upper ocean and lower atmosphere during the twentieth century dominated by quasi-biennial, interannual, quasi-decadal and interdecadal signals. The quasi-decadal signal in upper ocean temperature undergoes global warming/cooling of ~0.1°C, similar to that occurring with the interannual signal (i.e., El Niño-Southern Oscillation), both signals dominated by global warming/cooling in the tropics. From the National Centers for Environmental Prediction troposphere reanalysis and Scripps Institution of Oceanography upper ocean temperature reanalysis we examine the quasi-decadal global tropical diabatic heat storage (DHS) budget from 1975 to 2000. We find the anomalous DHS warming tendency of 0.3-0.9 W m-2 driven principally by a downward global tropical latent-plus-sensible heat flux anomaly into the ocean, overwhelming the tendency by weaker upward shortwave-minus-longwave heat flux anomaly to drive an anomalous DHS cooling tendency. During the peak quasi-decadal warming the estimated dissipation of DHS anomaly of 0.2-0.5 W m-2 into the deep ocean and a similar loss to the overlying atmosphere through air-sea heat flux anomaly are balanced by a decrease in the net poleward Ekman heat advection out of the tropics of 0.4-0.7 W m-2. This scenario is nearly the opposite of that accounting for global tropical warming during the El Niño. These diagnostics confirm that even though the global quasi-decadal signal is phase-locked to the 11-year signal in the Sun's surface radiative forcing of ~0.1 W m-2, the anomalous global tropical DHS tendency cannot be driven by it directly.
Cayan Daniel R.
Dettinger Michael D.
White Warren B.
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