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Seasonal and interannual variability of temperature inversions in the subarctic North Pacific*. March 17, 2006, 17:10-17:30 2 nd Argo Science Workshop Venice Convention Center. Hiromichi Ueno 1 , E. Oka 1 , T. Suga 1,2 & H. Onishi 3 1:Argo JAMSTEC 2:Tohoku Univ. 3:Hokkaido Univ.
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Seasonal and interannual variability of temperature inversions in the subarctic North Pacific*
E. Oka1, T. Suga1,2 & H. Onishi3
1:Argo JAMSTEC 2:Tohoku Univ.
*GRL 2005 (2005GL023948)
Uda 1963, Roden 1964
T-min <= Seasonal cycle of surface cooling & heating
with surplus precipitation
T-min:preserve the memory of
wintertime atmospheric conditions.
=> affect the SST
in the next winter
via re-emergence of T-min water
(Wirts & Johnson 2005)
T-inversions in the subarctic NP have been examined
mostly using historical hydrographic data, that are quite
limited in winter.
=>The formation and seasonal evolution of T-inversions
are not fully understood, and their interannual variation
Data & Method
T,S profiles recorded by Argo floats
during May 2001 - December 2005.
Def of T-min outcrop
T-min: considered to outcrop when the difference between T-min density & SSD < 0.03kg/m3.
∆T showed seasonality similar
to that in the western SNP
T-min: varies seasonally
cold in win <= outcropped & renewed every win
warm in sum <= summertime heating
=> ∆T: varies seasonally, => Same as Uda 1963 etc.
In addition, interannual ∆T variation is consistent with winter SST.
Results are consistent with
those by Wirts & Johnson 2005
Warm & fresh Anti-cyclonic Diameter: 200km
A composite SST emage
(Thomson & Gower, 1998)
Areas enclosed by eddis
TS sections through Haida eddies
(Whitney & Robert, 2002)
Argo data were analyzed to study seasonal/interannual variability of T-inversions in the whole subarctic NP (SNP).
In the western SNP and Bering Sea, Tmin outcropped every winter, causing a seasonal cycle in ∆T.
In the Gulf of Alaska in the eastern SNP, the Tmin outcropped in winters 02, 04 & 05, but scarcely outcropped in winter 03. Consequently, ∆T showed remarkable interannual variation.
The year-to-year variation of ∆T in each region of the SNP was consistent with and thereby attributable to that of the winter SST anomaly there.Summary (20/20)