ChapmanChapmanCrismanEtAl1998

Référence

Chapman, L.J., Chapman, C.A., Crisman, T.L. and Nordlie, F.G. (1998) Dissolved oxygen and thermal regimes of a Ugandan crater lake. Hydrobiologia, 385(1):201-211. (Scopus )

Résumé

This paper quantifies the temporal pattern of thermal stratification and deoxygenation in Lake Nkuruba, a small (3 ha), deep (maximum depth = 38 m) crater lake in western Uganda. Dissolved oxygen penetrated to an average depth of 9 m and a maximum depth of 15 m below which the lake was permanently anoxic over the 2 years of study. Although surface oxygen levels were correlated with both surface water temperature and rainfall, seasonal cycles of dissolved oxygen were not well-defined and may have been obscured by the high frequency of short-term fluctuations and by inter-annual variations caused by shifts in rainfall. Surface water temperature averaged 23.3±0.7°C (S.D.) and varied directly with air temperature. Both diurnal changes and top-bottom temperature differentials were small averaging 1.7±0.7 °C and 1.6±0.8°C, respectively. Thermal stability ranged from 101.3 to 499.9 g-cm cm-2 and was positively related to surface water temperature suggesting that this small protected lake responds rapidly to short-term meteorological changes. Because contribution to the annual heat exchange cycle was confined to upper waters, the lake's annual heat budget was low, 1,073.8 cal cm-2 yr-1. However, net primary productivity was relatively high averaging 1.3 g C m-2 d-1. The region where Lake Nkuruba is situated experienced a very strong earthquake (6.2 on the Richter scale) on 4 February, 1994. Subsequently, water levels dropped markedly in the lake, falling 3.14 m over a 5-month period. © 1998 Kluwer Academic Publishers.

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@ARTICLE { ChapmanChapmanCrismanEtAl1998,
    AUTHOR = { Chapman, L.J. and Chapman, C.A. and Crisman, T.L. and Nordlie, F.G. },
    TITLE = { Dissolved oxygen and thermal regimes of a Ugandan crater lake },
    JOURNAL = { Hydrobiologia },
    YEAR = { 1998 },
    VOLUME = { 385 },
    PAGES = { 201--211 },
    NUMBER = { 1 },
    __MARKEDENTRY = { [Luc:6] },
    ABSTRACT = { This paper quantifies the temporal pattern of thermal stratification and deoxygenation in Lake Nkuruba, a small (3 ha), deep (maximum depth = 38 m) crater lake in western Uganda. Dissolved oxygen penetrated to an average depth of 9 m and a maximum depth of 15 m below which the lake was permanently anoxic over the 2 years of study. Although surface oxygen levels were correlated with both surface water temperature and rainfall, seasonal cycles of dissolved oxygen were not well-defined and may have been obscured by the high frequency of short-term fluctuations and by inter-annual variations caused by shifts in rainfall. Surface water temperature averaged 23.3±0.7°C (S.D.) and varied directly with air temperature. Both diurnal changes and top-bottom temperature differentials were small averaging 1.7±0.7 °C and 1.6±0.8°C, respectively. Thermal stability ranged from 101.3 to 499.9 g-cm cm-2 and was positively related to surface water temperature suggesting that this small protected lake responds rapidly to short-term meteorological changes. Because contribution to the annual heat exchange cycle was confined to upper waters, the lake's annual heat budget was low, 1,073.8 cal cm-2 yr-1. However, net primary productivity was relatively high averaging 1.3 g C m-2 d-1. The region where Lake Nkuruba is situated experienced a very strong earthquake (6.2 on the Richter scale) on 4 February, 1994. Subsequently, water levels dropped markedly in the lake, falling 3.14 m over a 5-month period. © 1998 Kluwer Academic Publishers. },
    ADDRESS = { Wildlife Conservation Society, 2300 Southern Boulevard, Bronx, NY 10460, United States },
    COMMENT = { Cited By (since 1996):21 Export Date: 14 February 2014 Source: Scopus },
    KEYWORDS = { Anoxic hypolimnion, Heat budget, Hypoxia, Productivity, Stability, Stratification, Volcanic crater lake },
    OWNER = { Luc },
    TIMESTAMP = { 2014.02.14 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-0032439780&partnerID=40&md5=8e35be926a001cf114f6430953cfb641 },
}

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