DISSOLVED ORGANIC-MATTER AND UV ABSORPTION IN A TROPICAL HYPERHALINE ESTUARY

被引：30

作者：

PAGES, J

GADEL, F

机构：

[1] CTR RECH OCEANOG DAKAR THIAROYE, DAKAR, SENEGAMBIA

[2] UNIV PERPIGNAN, SEDIMENTOL & GEOCHIM MARINES LAB, F-66025 PERPIGNAN, FRANCE

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 1990年 / 99卷 / 1-2期

关键词：

D O I：

10.1016/0048-9697(90)90222-G

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Several surveys were carried out in a hyperhaline estuary, the Casamance River (Sénégal, West Africa). Light absorption (A) by water in the near-UV (250-360 nm) was measured. Absorption spectra (semi-log plot) are described by slope, S*, and by A254. Using literature data, we show the possibility of calculating dissolved organic carbon concentration [DOC] and mean molecular weight (MW) from A254 and S*. The "upstream" portion of the estuary is hydraulically isolated. [DOC] and MW are high. Dissolved organic matter (DOM) originates mostly from Phragmites swamps, and is concentrated during the dry season, despite flocculation and photolysis. New, more labile DOM is brought in during the rains. The seaward portion receives high- to medium-MW DOM from mangrove swamps, and loses some of it to the sea by tidal transport. In the median portion, low-MW DOM originates from phytoplankton. Aquatic primary production can partly be explained by DOM distribution. © 1990.

引用

页码：173 / 204

页数：32

共 135 条

[1]

Albaret, Les peuplements de poissons de la Casamance (Sénégal) en période de sécheresse, Rev. Hydrobiol. Trop., 20, pp. 291-310, (1987)

[2]

Alberts, Filip, Price, Williams, Williams, Elemental composition, stable carbon isotope ratios and spectrophotometric properties of humic substances occurring in a salt marsh estuary, Org. Geochem., 12, pp. 455-467, (1988)

[3]

Armstrong, Boalch, The ultra-violet absorption of sea water, Journal of the Marine Biological Association of the United Kingdom, 41, pp. 591-597, (1961)

[4]

Amstrong, Tibbitts, Photochemical combustion of organic matter in sea water, for nitrogen, phosphorus and carbon determination, Journal of the Marine Biological Association of the United Kingdom, 48, pp. 143-152, (1968)

[5]

Baker, Farr, Importance of dissolved organic matter produced by duckweed (Lemna minor) in a southern English river, Freshwater Biology, 17, pp. 325-330, (1987)

[6]

Benner, Peele, Hodson, Microbial utilization of dissolved organic matter from leaves of the red mangrove, Rhizophora mangle, in the Fresh Creek estuary, Bahamas. Estuarine Coastal Shelf Sci., 23, pp. 607-619, (1986)

[7]

Berry, Moll, Krausse, Physical and chemical environment of the Gambia River, West Africa, 1983–1984, Great Lakes Mar. Waters Centr. Int. Programs Rep. No. 9, (1985)

[8]

Bird, Kalff, Empirical Relationships between Bacterial Abundance and Chlorophyll Concentration in Fresh and Marine Waters, Canadian Journal of Fisheries and Aquatic Sciences, 41, pp. 1015-1023, (1984)

[9]

Bjornsen, Phytoplankton exudation of organic matter: Why do healthy cells do it?, Limnology and Oceanography, 33, pp. 151-154, (1988)

[10]

Boto, Wellington, Seasonal variations in concentrations and fluxes of dissolved organic and inorganic materials in a tropical, tidally-dominated, mangrove waterway, Marine Ecology Progress Series, 50, pp. 151-160, (1988)

← 1 2 3 4 5 6 7 8 9 10 →