HR: 16:45h
AN: H22H-04    [PDF]
TI: INTRASEASONAL VARIABILITY OF SEA SURFACE TEMPERATURE: A VIEW FROM THE NASA/EOS AQUA SATELLITE
AU: * Xu, J
EM: jxu@hwr.arizona.edu
AF: University of Arizona, Department of Hydrology and water resource, Tucson, AZ 85721 United States
AU: * Xu, J
EM: jxu@hwr.arizona.edu
AF: University of California, Irvine, Department of Civil & Environmental Engineering, Irvine, CA 92697-2175 United States
AU: Sorooshian, S
EM:
AF: University of California, Irvine, Department of Civil & Environmental Engineering, Irvine, CA 92697-2175 United States
AU: Gao, X
EM:
AF: University of California, Irvine, Department of Civil & Environmental Engineering, Irvine, CA 92697-2175 United States
AU: Li, J
EM:
AF: University of Arizona, Department of Hydrology and water resource, Tucson, AZ 85721 United States
AU: Li, J
EM:
AF: University of California, Irvine, Department of Civil & Environmental Engineering, Irvine, CA 92697-2175 United States
AB: Based on the AQUA/MODIS sea surface temperature (SST) data, the features of intraseasonal SST perturbation have been investigated. The preliminary results display many interesting phenomena, which haven't been documented in previous SST analyses. The daily MODIS/SST data from April to June 2003 were processed, covering the global domain between 50§S and 50§N. In terms of wavelet transform analysis, the intraseasonal oscillations with 2-week and MJO (30-60 days) have been identified. These two perturbation components shared similar distribution patterns. In the tropical-subtropical zone (i.e., 30$\deg$S-30$\deg$N), the perturbations were weak ($<$0.3$\deg$C) in large oceanic bodies, but were medium (~0.6$\deg$) to strong (~1$\deg$C) in special regions: (1) medium SST perturbations were forward along the coastlines of many continents, namely in the eastern Pacific along the west coast of the Americas, in the western Pacific along the east coast of Asia (but not Australia), and in the western Atlantic along the west coast of Africa; (2) an elongated strong MJO perturbation area was found in the equatorial eastern Pacific; (3) medium perturbations were in the Pacific ITCZ, Atlantic ITCZ, Pacific warm pool, and northern Indian Ocean; and (4) a strong 2-week SST perturbation was shown in eastern Pacific west of Baja California. The two extratropical zones (i.e., 30$\deg$N-50$\deg$N and 30$\deg$S-50$\deg$S) each had an extensive 2-week perturbation band with localized strong perturbation areas inside. In the northern band, a large ($\deg$) circular MJO SST perturbation area was centered at 170$\deg$W and 30$\deg$N and a chain of 2-week perturbation areas existed in the northwestern Atlantic. The southern band exhibited a series of 2-week perturbation areas distributed along the Indian, Pacific, and Atlantic Oceans and two MJO SST perturbation areas were southwest of Austria and east of South Africa. The evolution of MJO SST perturbation in the Pacific Ocean showed that the SST perturbations in the area centered at 170$\deg$W and 30$\deg$N and in the area centered at 140$\deg$E and 20$\deg$N constitute a pair of inverse variations. However, the 2-week SST perturbations seemed not as coherent and structural as the MJO SST perturbations.
DE: 1894 Instruments and techniques
DE: 1899 General or miscellaneous
DE: 4275 Remote sensing and electromagnetic processes (0689)
DE: 4504 Air/sea interactions (0312)
DE: 4572 Upper ocean processes
SC: Hydrology [H]
MN: 2003 Fall Meeting