High salinity events in the northern Arabian Sea and Sea of Oman

Wang, Zhankun; DiMarco, Steven F.; Jochens, Ann E.; Ingle, Stéphanie

doi:10.1016/j.dsr.2012.12.004

Cited by 29 publications

(21 citation statements)

References 21 publications

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“…The lower salt tolerance threshold of Prochlorococcus SS120 could reflect the characteristics of its native environment, namely that the average salt concentration is between 3.5 and 3.8%. In contrast, Prochlorococcus AS9601 is an isolate from the Arabian Sea (Shalapyonok et al, 1998), and the average salt concentration in the water is reported to exceed 4.0% (Wang et al, 2013). Therefore, we suspect that the AS9601 strain is adapted to survive in seawater containing higher salt concentrations when compared to Prochlorococcus isolates from other parts of the world's oceans.…”

Section: Salt Acclimated Cells Exhibit Slower Growth Ratesmentioning

confidence: 82%

Global transcriptome analysis of salt acclimated Prochlorococcus AS9601

Al-Hosani¹,

Oudah

Henschel

et al. 2015

Microbiological Research

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Molecular processes leading to salt stress acclimation in the model cyanobacterium Prochlorococcus are not known. To address this, we used RNA sequencing (RNAseq) to compare the global transcriptome of two exponential-phase populations of Prochlorococcus AS9601 cells - acclimated to high salt (5%, w/v) and normal seawater salt (3.8%, w/v). Experiments showed that salt acclimated cells exhibit slower growth rates with a doubling time almost twice as controls. Approximately 1/3 of the genome was found to be differentially expressed (p-value <0.05), but a considerably large number of these genes are "hypothetical proteins" with unknown function. Transcript abundance were higher for genes involved in respiratory electron flow, carbon fixation, osmolyte/compatible solute biosynthesis and inorganic ion transport. Many of the highly expressed genes are 'high light inducible proteins' believed to be part of the general Prochlorococcus stress response. Transcript abundance were lower for genes involved in photosynthetic electron transport and cell division. The relative reduction in transcript abundance for genes encoding proteins containing heme groups and iron transporters suggests cellular iron requirements in salt acclimated cells maybe lower. The results presented here provide the first glimpse into global gene expression changes in Prochlorococcus cells due to salt stress.

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Section: Salt Acclimated Cells Exhibit Slower Growth Ratesmentioning

confidence: 82%

Global transcriptome analysis of salt acclimated Prochlorococcus AS9601

Al-Hosani¹,

Oudah

Henschel

et al. 2015

Microbiological Research

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“…These ejections were related to the presence of mesoscale eddies in the Sea of Oman, and especially to the presence of a dipole in spring; different offshore ejection mechanisms were identified. PGW ejection was also identified in response to tropical atmospheric cyclones (in particular cyclone Gonu; Wang et al, 2012Wang et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, in October-November 1999, during the fall intermonsoon, the GOGP99 1 experiment at sea sampled the PGW outflow and identified it as a coastal flow, extending to the southern coast of Oman (see Pous et al, 2004). During other seasons, the path of the PGW in the Gulf of Oman is less regular, as shown by observations and by numerical modeling; also, PGW can exit in the form of short pulses (see Banse, 1997;Senjyu et al, 1998;Bower et al, 2000;Prasad et al, 2001;Thoppil and Hogan, 2009;Wang et al, 2012;Wang et al, 2013). Recently, ARGO floats (see Carton et al, 2012;L'Hégaret et al, 2013) and HYCOM numerical simulations (see L'Hégaret et al, 2015) confirmed that during other seasons, PGW can be expelled from the coast into the Sea of Oman.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale eddies and submesoscale structures of Persian Gulf Water off the Omani coast in spring 2011

et al. 2016

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“…Evidence has been shown of seasonal or higher-frequency variability of the surface circulation in the Sea of Oman, which has been related to atmospheric forcing (seasonal wind stress or the effect of atmospheric cyclones) or to Rossby waves emitted from the eastern boundary (Pakistan and India; see Schott et al, 2009). In particular, mesoscale oceanic dipoles (cyclone + anticyclone), as well as isolated eddies, have been observed in the vicinity of Ra's al Hamra (see L'Hegaret et al, 2013) and off Ra's al Hadd (see Wang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Mesoscale variability in the Arabian Sea from HYCOM model results and observations: impact on the Persian Gulf Water path

L’Hégaret

Duarte²,

Carton

et al. 2015

Ocean Sci.

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Abstract. The Arabian Sea and Sea of Oman circulation and water masses, subject to monsoon forcing, reveal a strong seasonal variability and intense mesoscale features. We describe and analyze this variability and these features, using both meteorological data (from ECMWF reanalyses), in situ observations (from the ARGO float program and the GDEM -Generalized Digital Environmental mode -climatology), satellite altimetry (from AVISO) and a regional simulation with a primitive equation model (HYCOM -the Hybrid Coordinate Ocean Model). The model and observations display comparable variability, and the model is then used to analyze the three-dimensional structure of eddies and water masses with higher temporal and spatial resolutions than the available observations. The mesoscale features are highly seasonal, with the formation of coastal currents, destabilizing into eddies, or the radiation of Rossby waves from the Indian coast. The mesoscale eddies have a deep dynamical influence and strongly drive the water masses at depth. In particular, in the Sea of Oman, the Persian Gulf Water presents several offshore ejection sites and a complex recirculation, depending on the mesoscale eddies. The associated mechanisms range from coastal ejection via dipoles, alongshore pulses due to a cyclonic eddy, to the formation of lee eddies downstream of Ra's Al Hamra. This water mass is also captured inside the eddies via several mechanisms, keeping high thermohaline characteristics in the Arabian Sea. The variations of the outflow characteristics near the Strait of Hormuz are compared with variations downstream.

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High salinity events in the northern Arabian Sea and Sea of Oman

Cited by 29 publications

References 21 publications

Global transcriptome analysis of salt acclimated Prochlorococcus AS9601

Global transcriptome analysis of salt acclimated Prochlorococcus AS9601

Mesoscale eddies and submesoscale structures of Persian Gulf Water off the Omani coast in spring 2011

Mesoscale variability in the Arabian Sea from HYCOM model results and observations: impact on the Persian Gulf Water path

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