Shi, W,Morrison, John M,Böhm, Emanuele,Manghnani, Vijayakumar
The Oman upwelling zone during 1993, 1994 and 1995 Journal Article
In: Deep Sea Research Part II: Topical Studies in Oceanography, vol. 47, no. 472, pp. 1227-1247, 2000, ISBN: 0967-0645.
Abstract | BibTeX | Tags: Arabian Sea, Hydro-biology, Interannual variability, oceanography, Oman, sea surface temperature, seasonal variation, Sultanate of Oman, Upwelling
@article{,
title = {The Oman upwelling zone during 1993, 1994 and 1995},
author = {Shi, W,Morrison, John M,Böhm, Emanuele,Manghnani, Vijayakumar},
issn = {0967-0645},
year = {2000},
date = {2000-01-01},
journal = {Deep Sea Research Part II: Topical Studies in Oceanography},
volume = {47},
number = {472},
pages = {1227-1247},
abstract = {Satellite-derived sea-surface temperature, TOPEX/POSEIDON (T/P) sea-level anomalies
(SLAs), model wind data, and hydrographic data are used to characterize the upwelling along
the Oman coast during the US Joint Global Ocean Flux Study (US JGOFS) Arabian Sea
Process Study (ASPS) in 1995 as well as to look at interannual variability in the upwelling over
the period 1993}1995.
Empirical orthogonal function (EOF) analysis of the satellite-derived sea-surface temperature
(SST) at the locations of the US JGOFS standard stations shows the "rst mode, which
represents a biannual variability, contributes 67% of the total variance. In addition, the SST
shows the upwelling `fronta moving o!shore with the development of Southwest (SW) Monsoon
in early June 1995, reaching a maximum distance of approximately 120 km by late August
1995. Finally, SST shows the persistence of cold upwelling waters for nearly a month after the
end of the SW Monsoon within the bays along the Oman coast.
TOPEX/POSEIDON SLAs indicate that with the onset of the SW Monsoon, a 30-cm drop
in steric height is observed along the Oman coast associated the presence of the cool upwelled
waters. This drop in steric height sets up a horizontal pressure gradient and results in
a compensating along-shore, northeastward-#owing, geostrophic current (East Arabian
Current; EAC) during the SW Monsoon. Similarly, the altimeter data slow an o!shore decrease
in steric height during the Northeast (NE) Monsoon, indicating a seasonal reversal in direction
of the EAC with #ow to the southwest. Subsurface temperature data indicate that the actual
uplifting of isotherms associated with the upwelling can be found to a distance of approximately
260 km from the shore and to a depth of 150}200 m. Using along-track altimetry data, we
estimate that, for a region 260 km in o!shore distance and 600 km alongshore, 2.2]106,
1.4]106 and 0.55]106 m3 s~1 were upwelled through the 100 m level with upwelling velocities
O (2.0]10~5 m s~1), during the SW Monsoons of 1993, 1994 and 1995, respectively. The
reduced upwelling in the summer of 1995 is attributed to a reduction in wind-stress curl along
the Arabian coast when compared to 1993 and 1994. ( 2000 Elsevier Science Ltd. All rights
reserved.},
keywords = {Arabian Sea, Hydro-biology, Interannual variability, oceanography, Oman, sea surface temperature, seasonal variation, Sultanate of Oman, Upwelling},
pubstate = {published},
tppubtype = {article}
}
Satellite-derived sea-surface temperature, TOPEX/POSEIDON (T/P) sea-level anomalies
(SLAs), model wind data, and hydrographic data are used to characterize the upwelling along
the Oman coast during the US Joint Global Ocean Flux Study (US JGOFS) Arabian Sea
Process Study (ASPS) in 1995 as well as to look at interannual variability in the upwelling over
the period 1993}1995.
Empirical orthogonal function (EOF) analysis of the satellite-derived sea-surface temperature
(SST) at the locations of the US JGOFS standard stations shows the "rst mode, which
represents a biannual variability, contributes 67% of the total variance. In addition, the SST
shows the upwelling `fronta moving o!shore with the development of Southwest (SW) Monsoon
in early June 1995, reaching a maximum distance of approximately 120 km by late August
1995. Finally, SST shows the persistence of cold upwelling waters for nearly a month after the
end of the SW Monsoon within the bays along the Oman coast.
TOPEX/POSEIDON SLAs indicate that with the onset of the SW Monsoon, a 30-cm drop
in steric height is observed along the Oman coast associated the presence of the cool upwelled
waters. This drop in steric height sets up a horizontal pressure gradient and results in
a compensating along-shore, northeastward-#owing, geostrophic current (East Arabian
Current; EAC) during the SW Monsoon. Similarly, the altimeter data slow an o!shore decrease
in steric height during the Northeast (NE) Monsoon, indicating a seasonal reversal in direction
of the EAC with #ow to the southwest. Subsurface temperature data indicate that the actual
uplifting of isotherms associated with the upwelling can be found to a distance of approximately
260 km from the shore and to a depth of 150}200 m. Using along-track altimetry data, we
estimate that, for a region 260 km in o!shore distance and 600 km alongshore, 2.2]106,
1.4]106 and 0.55]106 m3 s~1 were upwelled through the 100 m level with upwelling velocities
O (2.0]10~5 m s~1), during the SW Monsoons of 1993, 1994 and 1995, respectively. The
reduced upwelling in the summer of 1995 is attributed to a reduction in wind-stress curl along
the Arabian coast when compared to 1993 and 1994. ( 2000 Elsevier Science Ltd. All rights
reserved.
(SLAs), model wind data, and hydrographic data are used to characterize the upwelling along
the Oman coast during the US Joint Global Ocean Flux Study (US JGOFS) Arabian Sea
Process Study (ASPS) in 1995 as well as to look at interannual variability in the upwelling over
the period 1993}1995.
Empirical orthogonal function (EOF) analysis of the satellite-derived sea-surface temperature
(SST) at the locations of the US JGOFS standard stations shows the "rst mode, which
represents a biannual variability, contributes 67% of the total variance. In addition, the SST
shows the upwelling `fronta moving o!shore with the development of Southwest (SW) Monsoon
in early June 1995, reaching a maximum distance of approximately 120 km by late August
1995. Finally, SST shows the persistence of cold upwelling waters for nearly a month after the
end of the SW Monsoon within the bays along the Oman coast.
TOPEX/POSEIDON SLAs indicate that with the onset of the SW Monsoon, a 30-cm drop
in steric height is observed along the Oman coast associated the presence of the cool upwelled
waters. This drop in steric height sets up a horizontal pressure gradient and results in
a compensating along-shore, northeastward-#owing, geostrophic current (East Arabian
Current; EAC) during the SW Monsoon. Similarly, the altimeter data slow an o!shore decrease
in steric height during the Northeast (NE) Monsoon, indicating a seasonal reversal in direction
of the EAC with #ow to the southwest. Subsurface temperature data indicate that the actual
uplifting of isotherms associated with the upwelling can be found to a distance of approximately
260 km from the shore and to a depth of 150}200 m. Using along-track altimetry data, we
estimate that, for a region 260 km in o!shore distance and 600 km alongshore, 2.2]106,
1.4]106 and 0.55]106 m3 s~1 were upwelled through the 100 m level with upwelling velocities
O (2.0]10~5 m s~1), during the SW Monsoons of 1993, 1994 and 1995, respectively. The
reduced upwelling in the summer of 1995 is attributed to a reduction in wind-stress curl along
the Arabian coast when compared to 1993 and 1994. ( 2000 Elsevier Science Ltd. All rights
reserved.