Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

in Goa, India, by 3 - 4 days. Wind speed and direction data were necessary to establish a dynamical mechanism between times
of onset of 12 m/s wind speed off Somalia and rainfall in Goa. Except for NSCAT, no satellite scatterometer wind product recorded
adequately sampled 2-day 1deg x 1deg averaged wind vectors, which are the required space and time scales, to examine the windrain
relationship in other years. However, the greater-than-95% steadiness of summer monsoon winds allows an opportunity to
use satellite measurements of surface wind speed. The Special Sensor Microwave Imager (SSMI) recorded surface wind speed
with adequate sampling to produce a 1-day, 1deg x 1deg data product during 1988 - 1998. SSMI data had been uniformly processed
throughout the period. Times of onset of 12 m/s wind speed off Somalia determined with the SSMI data set were 21 May 1988,
24 May 1989, 17 May 1990, 28 May 1991, 8 June 1992, 28 May 1993, 30 May 1994, 7 June 1995, 29 May 1996, 12 June 1997,
and 15 May 1998. Uncertainty of the 1992 and 1996 times of onset were increased because of the absence of SSMI data on 6 and
7 June 1992 and on 30 May 1996. Correlations of timing of monsoon wind onset with El Nino will be described. Variability of
the time difference between times of onset of 12 m/s wind speed and Goa rainfall will be discussed. At the time of submission
of the abstract, the Goa rainfall data have not arrived from the India Meteorological Department.
Author
Climatology; Wind Velocity; Monsoons; Rain; Forecasting
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OCEANOGRAPHY
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20000062848 Lamont-Doherty Geological Observatory, Palisades, NY USA
Tritium/He-3 and O-18 Measurements During the ACSYS Expedition 1996 Final Report, 1 Apr. 1996 - 31 Mar. 1999
Schlosser, Peter; Apr. 20, 2000; 3p; In English
Contract(s)/Grant(s): N00014-96-1-0612
Report No.(s): AD-A377474; LDEO-5-21759; No Copyright; Avail: CASI; A01, Hardcopy; A01, Microfiche
This proposal requested half the funds required for collection, measurement, and interpretation of about 500 tritium/He-3 and
500 O-18 samples in the framework of the Swedish/German ACSYS (Arctic Climate System Study) cruise to the eastern Arctic
Ocean in 1996. The work was focused on closing the existing tracer data gap in the eastern part of the Eurasian Basin. Coverage
of this part of the Arctic Ocean will provide the link between the tracer distributions observed just north of Fram Strait and in the
central Eurasian Basin along about 30 deg. E and the region where shelf waters enter the Transpolar Drift.
DTIC
Tritium; Helium Isotopes; Oxygen 18; Radioactive Isotopes
20000063527 California Univ., Ocean Physics Lab., Santa Barbara, CA USA
High Resolution Time Series Observations of Bio-Optical and Physical Variability in the Arabian Sea Final Report
Dickey, Tommy D.; May 01, 2000; 5p; In English
Contract(s)/Grant(s): N00014-96-1-0505
Report No.(s): AD-A377005; No Copyright; Avail: CASI; A01, Hardcopy; A01, Microfiche
A mooring instrumented with optical and physical sensors within the upper 300 m was deployed for two consecutive 6-month
periods (October 15, 1994 through October 20, 1995) in the central Arabian Sea (15 degrees 30’N, 61 degrees 30’E). Both the
Northeast (NE) and southwest (5W) Monsoons were observed. During the NE Monsoon, wind speeds averaged 6m/s and reached
up to 15 m during the 5W Monsoon. Intermonsoon periods (Spring, SI, and Fall, H) were characterized by weak and variable
winds. Shortwave radiation and photosynthetically available radiation (PAR) displayed biannual cycles, peaking during the intermonsoon
periods. The maximum winter mixed layer depth (MLD(1 degree C) 110 m) was deeper than the summer mixed layer
(MLD(1 degree C) 80 m) primarily because of surface cooling and convection. A biannual cycle in chlorophyll was evident with
greater values occurring during each monsoon and into the intermonsoon periods. High chlorophyll values associated with cool
mesoscale features were also apparent during each monsoon. These mesoscale features and others have been documented using
remotely sensed sea-surface height anomaly maps. Our results indicate that biological variability is important for the seasonal
variability of the upper ocean heat budget of the central Arabian Sea.
DTIC
Marine Biology; Optical Measuring Instruments; Remote Sensing; Arabian Sea; Chlorophylls
139