Advection of upwelled waters in the form of plumes off Oman during the Southwest Monsoon

Manghnani, Vijayakumar; Morrison, John M.; Hopkins, Thomas S.; Böhm, E.

doi:10.1016/s0967-0645(98)00062-9

Cited by 86 publications

(42 citation statements)

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“…Finally, this EKE budget potentially offers an alternative scenario from the one of Manghnani et al (1998) to explain the lateral export of upwelled waters. Mesoscale eddies, resulting from barotropic and baroclinic instabilities of the jet, play a role in stirring upwelled waters away from coast.…”

Section: Eddy Kinetic Energymentioning

confidence: 99%

Western boundary upwelling dynamics off Oman

et al. 2017

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Despite its climatic and ecosystemic significance, the coastal upwelling that takes place off Oman is not well understood. A primitive-equation, regional model forced by climatological wind stress is used to investigate its dynamics and to compare it with the better-known Eastern Boundary Upwellings (EBUs). The solution compares favorably with existing observations, simulating well the seasonal cycles of thermal structure, surface circulation (mean and turbulent), and sea-surface temperature (SST). There is a 1.5-month lag between the maximum of the upwellingfavorable wind-stress-curl forcing and the oceanic response (minima in sea-surface height and SST), which we attribute to onshore-propagating Rossby waves. A southwestwardflowing undercurrent (opposite to the direction of the nearsurface flow) is also simulated with a core depth of 1000 m, much deeper than found in EBUs (150-200 m). An EKE budget reveals that, in contrast to EBUs, the upwelling jet is more prone to barotropic than baroclinic instability and the contribution of locally-generated instabilities to EKE is higher by an order of magnitude. Advection and redistribution of EKE by standing mesoscale features also play a significant role in EKE budget.

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Section: Eddy Kinetic Energymentioning

confidence: 99%

Western boundary upwelling dynamics off Oman

et al. 2017

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“…The winds extend far offshore and impact a large area over the ocean, overlapping with the Findlater jet and the corresponding Indian-Monsoon system (Findlater, 1969). The coast of Oman is among the most intense upwelling regions of the world, with SSTs 58C or more below the ambient offshore temperature and branches of cold water extending into the Arabian Sea (Elliot and Savidge, 1990;Manghnani et al, 1998). Strong channelling of the flow parallel to the coast and upwelling gives rise to the East Arabian Current (Shi et al, 2000).…”

Section: The Arabian-peninsula Coastal Jetmentioning

confidence: 99%

Global distribution and seasonal variability of coastal low-level jets derived from ERA-Interim reanalysis

Ranjha

Svensson

Tjernström

et al. 2013

Tellus A: Dynamic Meteorology and Oceanography

157

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A B S T R A C TA low-level wind maximum is often found over the oceans near many coasts around the world. These Coastal Low-Level Jets (CLLJs) play an important role in the coastal weather and have significant impacts on regional climate and ecology as well as on a number of human activities. The presence of CLLJs is related to various local circumstances such as land-sea temperature contrasts, upwelling, coastal terrain, orientation of the coast, and so on, but also to the large-scale atmospheric dynamics. This makes studies of CLLJs not only interesting but also challenging. In this study, based on ERA-Interim reanalysis data, the global distribution, spatiotemporal structure and the seasonal variability of CLLJs are documented. Seasonal data from 1980 to 2011 are used to identify areas where CLLJs are frequently found in the lowest 2 km, following criteria based on the vertical profiles of wind speed and temperature. The results are analysed to highlight the fundamental aspects and distinctive features of the CLLJs across the globe, including their occurrence rate, jet height, maximum wind speed and horizontal extent. Global maps of CLLJs are constructed for the summer and winter seasons. The west coasts of North America, the Iberian Peninsula, north-western Africa and the south-eastern coast of the Arabian Peninsula make up the Northern Hemispheric CLLJ regions, while the west coasts of South America, Australia, and southern Africa comprise the South Hemispheric equivalents. The existence and characteristics of CLLJs along the southern coast of Oman and the western coast of the Iberian Peninsula regions are also discussed, not fully envisaged before in the context of CLLJs. The highest occurrence of CLLJs is found during the summer in both hemispheres, and the coast of Oman has the globally highest CLLJ frequency, with also the highest maximum wind speeds. The most commonly found CLLJ has a maximum wind speed between 9 and 15 m s(1 , and occurs at heights between 500 and 700 m a.s.l.

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“…1999). Satellite temperature and acoustic Doppler current pro"les (ADCP) show that the S07 region was the site of well-de"ned eddy and "lament activity during the SW Monsoon (Flagg and Kim, 1998;Manghnani et al, 1998;Lee et al, 2000). …”

Section: Wind Stress and Ekman Upwellingmentioning

confidence: 99%

“…While the current "lament was present and well de"ned 723 km o!shore, at least a portion of the water in this "lament was upwelled adjacent to the Omani coast, as indicated by the physical and chemical properties of water in the "lament (Arnone et al, 1996;Brink et al, 1996Brink et al, , 1998Manghnani et al, 1998). The lower temperature of the "lament indicates that the water was recently upwelled, but the low salinity in the upper 50 m and the slightly higher salinity at depth indicate that the cool, surface water of the "lament was not locally upwelled (Fig.…”

Section: Filaments and Eddiesmentioning

confidence: 99%