Seasonal Climatologies and Variability of Eastern Tropical Pacific Surface Waters

Fiedler, Paul C. (1992) Seasonal Climatologies and Variability of Eastern Tropical Pacific Surface Waters. NOAA/National Marine Fisheries Service, (NOAA Technical Report NMFS, 109)

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Interannual variability caused by the El Nino-Southern Oscillation in the eastern tropical Pacific Ocean (ETP) is analogous to seasonal variability of comparable magnitude. Climatological spatial patterns and seasonal variability of physical variables that may affect the ETP ecosystem are presented and discussed. Surface temperature, surface salinity, mixed layer depth, thermocline depth, thermocline strength, and surface dynamic height were derived from bathythermograph, hydrocast, and CTD data. Surface current velocity, divergence, and upwelling velocity were derived from ship drift reports. Surface wind velocity, wind stress, wind divergence, wind stress curl, and Ekman pumping velocity were derived from gridded pseudostress data obtained from Florida State University. Seasonal maps of these variables, and their deviations from the annual mean, show different patterns of variation in Equatorial (S°S-SON) and Tropical Surface Water (SOlS0N). Seasonal shifts in the trade winds, which affect the strength of equatorial upwelling and the North Equatorial Countercurrent, cause seasonal variations in most variables. Seasonal and interannual variability of surface temperature, mixed layer depth, thermocline depth and wind stress were quantified. Surface temperature, mixed layer depth and thermocline depth, but not local wind stress, are less variable in Tropical Surface Water than in Equatorial Surface Water. Seasonal and interannual variability are close to equal in most of the ETP, within factors of 2 or less. (PDF file contains 70 pages.)

Item Type: Monograph or Serial Issue
Title: Seasonal Climatologies and Variability of Eastern Tropical Pacific Surface Waters
Personal Creator/Author:
Fiedler, Paul C.
Series Name: NOAA Technical Report NMFS
Number: 109
Date: 1992
Publisher: NOAA/National Marine Fisheries Service
Issuing Agency: United States National Marine Fisheries Service
Subjects: Ecology
Atmospheric Sciences
Item ID: 2706
Depositing User: Patti M. Marraro
Date Deposited: 31 Oct 2009 02:18
Last Modified: 29 Sep 2011 18:30

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