Gulf of Mexico, ocean-color surface-truth measurements

Austin, R. W.

doi:10.1007/bf00122024

Cited by 58 publications

(33 citation statements)

References 4 publications

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“…This occurs because CZCS The COADS is described by Woodruff et al [1987]. It data are archived in 2-min segments.…”

Section: Introductionmentioning

confidence: 99%

“…The dashed curve overlay represents the climatological mixed layer depth, estimated from all historical NODC a, data in the gulf (bottom depth > 50 m; see text). (Bottom) Solid curves show monthly mean SST estimated from 5 years of AVHRR data (1983)(1984)(1985)(1986)(1987). and the dotted curves represent the standard error envelope of the series.…”

Section: Introductionmentioning

confidence: 99%

“…This appears to be the result of than 0.5 occurred relative to the mean density within the interannual variation in the chlorophyll concentration of upr1 ,uigtemnhyciaooia Figure 1. The series were derived from 5 years of AVHRR data (1983)(1984)(1985)(1986)(1987) and from a subset (1978)(1979)(1980)(1981)(1982)(1983)(1984)(1985)(1986)(1987)(1988) of the COADS data set for the 2° x 20 boxes closest to the center of the subregions of interest.…”

Section: Introductionmentioning

confidence: 99%

“…period [1978][1979][1980][1981][1982][1983][1984][1985][1986][1987][1988]. In general, the COADS observations satellite SST), showed a negative slope when regressed suggested that interannual variation within the against time (slope significantly different from 0 at the 0.001 gulf is relatively small.…”

Section: Introductionmentioning

confidence: 99%

“…These simple power functions may overestimate destruction of organic matter below 1000 m (JAHNKE and JACKSON, 1987). A variant on this theme is to ignore primary production, and use the particle export at the bottom of the euphotic zone and a power function to calculate fluxes at other depths , thereby reducing the variance in such estimates (BISHOP, 1989).…”

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confidence: 99%

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Arctic carbon sinks: Present and future

Walsh¹

1989

Global Biogeochemical Cycles

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92-30570I 17With past ONR support from Grant N00014-87-J-1218, we had successfully coupled simple biological models of phytoplankton production (light and nutrient regulation of one size fraction) to time-dependent, 3-dimensional physical models of basin circulation at 25-30 km resolution in the Gulf of Mexico . While these coupled models mimicked seasonal cycles of phytoplankton abundance in basin waters, as estimated by changes in chlorophyll stocks, they failed to replicate fluctuations of biological populations within more complex slope and shelf regions.Accordingly, a more diverse biological model of particle decay within the aphotic zone (3 size classes of phytoplankton, macroaggregates, and zooplankton fecal pellets) was coupled to a static, 2-dimensional model of slope circulation at 0.5 km resolution in the Middle Atlantic Bight (Walsh et al., 1991). By specifying the influx of these particles, both at the shelf-break and from the overlying slope euphotic zone, with variable sinking velocities, the second set of coupled models reproduced seasonal time series of organic carbon caught by moored sediment traps on the slope and rise.A total of 8 publications were derived from this ONR grant: yr-1 , gases, C0 2 , N 2 0, CH4, and freons, to the tenfold that of other high Arctic shelves, atmosphere, is attributed to altered ice/ and may supply 50% of the carbon snow albedo at sea level, i.e., melting of respiration demands within the halocline sea ice.A 5% decline of sea ice extent of the deep Canadian and Eurasian basins in the Arctic and Antarctic from 1979 to via brine-mediated runoff. Continued 1987 may have resulted in increased light melting of ice in the Arctic could availability within previously ice-covered increase by an order of magnitude the polar regions.If such a short-term trend present CO 2 sink of 1-0.i x 109 t C yr'. were to continue, it might lead to a negative biogeochemical feedback, i.e., enhanced extraction of atmospheric CO 2 INTRODUCTION during marine photosynthesis.As a consequence of deep vertical mixing in the The global temperature of surface air Antarctic Ocean, however, primary producincreaseu by 0.4*-0.5*C from 1880 to 1980, tion during the austral summer may have while temperatures of Arctic regions actually declined in response to a reduc-(%64*-90N) instead rose by as much as tion in extent of meltwater regions, where 1.2*-1.5 0 C over this period [Hansen et stratified water columns allow carbon al., 1983]. After 1980, six of the fixation tenfold that of open water.In warmest years in the past century have contrast, within shallow adjacent seas of subsequently been observed , 1981, the Arctic Ocean, where shelf regions are 1983, reflecting tenfold larger than those of the possible early signs of a "greenhouse" warming of the Earth [Hansen and Lebedeff, Copyright 1989Copyright 1988. Initial one-dimensional [Hansen et by the American Geophysical Union. al., 19811 and then three-dimensional climate models of varying sophisticationPaper number 90GB00583. [Mitchell,...

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“…This occurs because CZCS The COADS is described by Woodruff et al [1987]. It data are archived in 2-min segments.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Arctic carbon sinks: Present and future

Walsh¹

1989

Global Biogeochemical Cycles

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Development of Algae in Waters and a Possibility of Spectrometric in‐situ Monitoring

Mittenzwey

Rummel

1987

Acta hydrochim. hydrobiol.

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A short review is given on the product ion oftilgae, t,lieir influence on the matter budget, the damage to the biocoenosis of waters and on the purification processes of algae-enriched rawwaters. For t.lic devclupmentj and construction of'aii in-situ c1c.ric.e to monitor the content of phyto-Iilaiikton in eutrophicated waters on ships, measiirenients of the spectral reflec,t:tnc.e in shnllow inlarid and Bay waters were ninde froin 1983 t.ill l 9 G . Siinult~~~iieoiisly cIiloropliy11-a a n d secchidisk transparency were measured. Especiitlly marked correhtions (partly dependent 011 the sea so^ and the type of t'he 1vat)c.r body) exist bet~veen the quotient of reflectance at t,he wavelengtlis of 710 and WO nni and the clilorophyll-a conceiit'rat,ioiis (7 ... 320 pgil) and bet,ween the reflectance at 71i O n n i and rc.ciproc.al valiies of secrhi-disk transparency (0.3 ... 3.lJ in). On the basis of these resiilts a pvototype of n two-chamiel spectrometer \vns ~)rocliic.etl.

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Fluorescence and Reflectance for the in‐situ Determination of Some Quality Parameters of Surface Waters

Mittenzwey

Breitwieser

Penig

et al. 1991

Acta hydrochim. hydrobiol.

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Summary: Ship-based eltperirnents around Berlin and laboratory tests were carried out in order t o develop Spectroscopic methods for the in-sdtu determination of chlorophyll a (Chla) and chemical oltygen demand (COD,,) of surface waters. The regression analysis of spectroscopic data (reflectance (R); laser-stimulated and conventional fluorescence ( I F ) ) and chemical-biological data yielded correhtions of a relatively good quality.

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Gulf of Mexico, ocean-color surface-truth measurements

Cited by 58 publications

References 4 publications

Arctic carbon sinks: Present and future

Arctic carbon sinks: Present and future

Development of Algae in Waters and a Possibility of Spectrometric in‐situ Monitoring

Fluorescence and Reflectance for the in‐situ Determination of Some Quality Parameters of Surface Waters

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