Biophysical responses of the upper ocean to major Gulf of Mexico hurricanes in 2005

Gierach, M. M.; Subrahmanyam, Bulusu

doi:10.1029/2007jc004419

Cited by 71 publications

(68 citation statements)

References 24 publications

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“…7b), after which Hagibis crept westward to the coastline southeast of Vietnam. Comparing the present results with those of previous studies (Lin et al 2003, Shi & Wang 2007, Gierach & Subrahmanyam 2008, Shang et al 2008, we determined that the EPV was quite large in the case of Typhoon Hagibis (Table 2); this large value probably reflected the fact that Hagibis passed close to the equator (at 10°N), and the Coriolis parameter was about half that of other typhoons, which were tracked at approximately 20°N. Thus, the potential EPV calculated from Eq.…”

Section: Physical Mechanismsupporting

confidence: 71%

“…It should be noted that the lower temperatures lasted for about 3 wk (Fig. 2c,d), much longer than the period of reduced temperatures observed in previous studies (Gierach & Subrahmanyam 2008, Zhao et al 2008.…”

Section: Impact Of Hagibis On Chl a Concentrationmentioning

confidence: 60%

“…Investigations of the impacts of typhoons on the upper water levels of the ocean have determined that surface chlorophyll a (chl a) concentrations substantially increase after the passage of a typhoon (Subrahmanyam et al 2002, Lin et al 2003, McClain et al 2004, Zheng & Tang 2007, Gierach & Subrahmanyam 2008, McClain 2009, especially in oligotrophic waters (Babin et al 2004). The physical mechanism primarily responsible for the increase in chl a concentration is the typhoon's strong wind, which induces mixing and upwelling in the upper ocean (Price 1981) and brings both subsurface chl a to the surface and subsurface nutrients into the euphotic zone (Subrahmanyam et al 2002, Lin et al 2003, Babin et al 2004, Zheng & Tang 2007, Gierach & Subrahmanyam 2008.…”

Section: Introductionmentioning

confidence: 99%

“…The physical mechanism primarily responsible for the increase in chl a concentration is the typhoon's strong wind, which induces mixing and upwelling in the upper ocean (Price 1981) and brings both subsurface chl a to the surface and subsurface nutrients into the euphotic zone (Subrahmanyam et al 2002, Lin et al 2003, Babin et al 2004, Zheng & Tang 2007, Gierach & Subrahmanyam 2008. Although it is not clear whether the extra chl a is due to the upwelling of nutrients or of chl a, we are sure that both the typhoon-induced upwelling and the pre-existing eddies favor the enhancement of chl a (Walker et al 2005, Shi & Wang 2007, Zheng et al 2008, McClain 2009, Sun et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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Strong enhancement of chlorophyll a concentration by a weak typhoon

Sun¹,

Yang²,

Xian³

et al. 2010

Mar. Ecol. Prog. Ser.

122

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Recent studies demonstrate that chlorophyll a (chl a) concentrations in ocean surface waters can be significantly enhanced due to typhoons. The present study investigated chl a concentrations in the middle of the South China Sea (SCS) from 1997 to 2007. Only the Category 1 (minimal) Typhoon Hagibis (2007) had a notable effect on chl a concentrations. Typhoon Hagibis had a strong upwelling potential due to its location near the equator, and the forcing time of the typhoon (> 82 h) was much longer than the geostrophic adjustment time (~63 h). The higher upwelling velocity and the longer forcing time increased the depth of the mixed-layer, which consequently induced a strong phytoplankton bloom that accounted for about 30% of the total annual chl a concentration in the middle of the SCS. Induction of significant upper ocean responses can be expected if the forcing time of a typhoon is long enough to establish strong upwelling.

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Section: Physical Mechanismsupporting

confidence: 71%

Section: Impact Of Hagibis On Chl a Concentrationmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Strong enhancement of chlorophyll a concentration by a weak typhoon

Sun¹,

Yang²,

Xian³

et al. 2010

Mar. Ecol. Prog. Ser.

122

View full text Add to dashboard Cite

show abstract

“…The upper ocean response to a moving cyclone has been studied by many researchers [4]. Cyclone induced upwelling and enhanced vertical mixing causes the injection of nutrients to the euphotic zone and availability of sufficient light conditions for photosynthesis at surface [3] [5]- [8] which favors the condition of Chlorophyll-a concentration enhancement [9]- [13]. The studies on the phytoplankton blooms caused by tropical storms are crucial in understanding the mixing and biogeochemical processes in the oceans.…”

Section: Introductionmentioning

confidence: 99%

Impact of Cyclone PHAILIN on Chlorophyll-a Concentration and Productivity in the Bay of Bengal

Latha¹,

Rao²,

Nagamani³

et al. 2015

IJG

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Ocean colour remote sensing is one of the conventional methods in satellite oceanography used to study the biological response of the upper ocean to the tropical cyclones. This paper aims to study the impact of the Very Severe Cyclonic storm PHAILIN, and its consequence on the surface chlorophyll-a concentration distribution in the Bay of Bengal using Oceansat-2 Ocean Colour Monitor (OCM). The impact of this cyclone on ocean primary productivity has been studied using MODIS-A data. Sea surface temperature (SST) plays an important role in the generation of primary productivity along with the other oceanographic parameters; SST patterns in the Bay of Bengal during the cyclone period were studied. From the analysis, it is observed that the chlorophyll-a concentration has increased from 1.08 (before) to 7.06 mg/m 3 after the cyclone with an SST drop of ~3˚C (29.19˚C to 26˚C). The primary productivity has increased from 410.0506 to 779.9814 mg/C/m 2 /day after the cyclone. In addition to the above analysis, an attempt has also been made to study the impact of cyclone intensity on the chlorophyll concentration. The study shows that the comparison between cyclone intensity (CI) and chlorophyll concentration shows a positive relationship.

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Pulsed, cross‐shelf export of terrigenous dissolved organic carbon to the Gulf of Mexico

2014

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The export of terrigenous dissolved organic carbon (tDOC) and other river-borne material across the continental shelf boundary has important ramifications for biological productivity and the cycling of continentally derived bioelements in the ocean. Recent studies revealed the 275-295 nm spectral slope coefficient of chromophoric dissolved organic matter (CDOM), S 275-295 , is a reliable tracer for terrigenous dissolved organic carbon (tDOC) in river-influenced ocean margins. Here an empirical algorithm for the accurate retrieval of S 275-295 from ocean color was developed and validated using in situ optical properties collected seasonally in the northern Gulf of Mexico. This study also demonstrated S 275-295 is a robust proxy for tDOC concentration in this environment, thereby providing a means to derive surface tDOC concentrations on synoptic scales and in quasi-real time using remote sensing. The resulting tDOC-algorithm was implemented using Aqua-MODIS in a retrospective analysis of surface tDOC concentrations over the northern Gulf of Mexico between July 2002 and June 2013. Large pulses of tDOC were observed in continentalslope surface waters off the Mississippi River delta, indicating cross-shelf export of tDOC was sporadic and exhibited considerable interannual variability. Favorable winds following an anomalously high discharge from the Mississippi-Atchafalaya river system always coincided with a major export event, and in general, cross-shelf export was enhanced during years of anomalously high discharge. The tDOC-algorithm will find applicability in the assessment of future climate-and human-induced changes in tDOC export, in biogeochemical models of the continental shelf, and in the validation of high-resolution coastal models of buoyancy-driven shelf circulation.

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Biophysical responses of the upper ocean to major Gulf of Mexico hurricanes in 2005

Cited by 71 publications

References 24 publications

Strong enhancement of chlorophyll a concentration by a weak typhoon

Strong enhancement of chlorophyll a concentration by a weak typhoon

Impact of Cyclone PHAILIN on Chlorophyll-a Concentration and Productivity in the Bay of Bengal

Pulsed, cross‐shelf export of terrigenous dissolved organic carbon to the Gulf of Mexico

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