Deep-water warming trend in Lake Malawi, East Africa

Vollmer, Martin K.; Bootsma, Harvey A.; Hecky, Robert E.; Patterson, Graeme; Halfman, John D.; Edmond, John M.; Eccles, David H.; Weiss, Ray F.

doi:10.4319/lo.2005.50.2.0727

Cited by 112 publications

(107 citation statements)

References 9 publications

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“…Fe 2+ and Mn 2+ were analysed using GBC 906A Scientific Equipment. SO 4 2-was determined by ion chromatography (IC Dionex). The development of surface water temperatures influenced by different weather variables at Lake Tegel was analysed for the period from 1980 to 2007 on a monthly data set.…”

Section: Analytical Methods and Analysismentioning

confidence: 99%

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Effects of water warming on bank filtration: experimental enclosure studies

Groß-Wittke

Selge

Gunkel

2013

Water Resources Management VII

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In the context of climate change artificial recharge of groundwater becomes increasingly important. The two main climate change factors affecting ground water recharge performance are water warming and extreme precipitation events with drought and floods. This will strongly influence self-purification processes, indirectly due to changes in the stratification and circulation characteristics of the lake and directly due to the intensification of metabolic processes and biodegradation efficiency, which are responsible for water self-purification.At the study site Lake Tegel, Berlin (Germany), epilimnion water warming of 0.9°C per decade from 1980 to 2007 was detected. Moreover, continuous measurements of temperature for a yearly period from 2010 to 2011 in the openwater epilimnion and littoral zone showed a maximum difference of 5.2°C on a sunny summer day (T Lake,max = 25.3°C, T Air,max = 26.2°C).The present work describes the development and operation of enclosure field experiments conducted to simulate water warming (up to 30°C) and to provide a detailed picture of the processes which occur in the uppermost sediment layers (0-20 cm depth) at a littoral bank site. To illustrate the performance of the enclosure setup with a mean temperature increase of 4.6°C (May-August 2012), microbial activity as well as pore water analysis was examined monthly. Microbial activity was measured by enzymatic TTC-and FDA-methods. Both showed a highly microbial active upper layer down to 5 and 10 cm depth, respectively. However, no clear water warming effects on redox-chemical and microbial activity could be detected.This paper is intended to contribute to an ongoing discussion, if in-situ enclosures enable realistic experimental studies to allow investigations of the Water Resources Management VII 209

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Section: Analytical Methods and Analysismentioning

confidence: 99%

“…Significant water warming caused by climate change has been measured by many authors [1][2][3][4][5]. Empirical studies show that surface water temperature closely follows air temperature but it is also influenced by wind speed, humidity, cloud cover and clear-sky solar radiation as a predetermined variable [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effects of water warming on bank filtration: experimental enclosure studies

Groß-Wittke

Selge

Gunkel

2013

Water Resources Management VII

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“…This experiment is one of the only deployments of oceanbottom seismometers (OBS) in a freshwater, lake environment. Additionally, Lake Malawi, as with other large African rift lakes, is characterized by a permanent temperature-induced density stratification and is anoxic below ∼220 m (Vollmer et al 2005). Here, we present the first attempt to apply standard OBS processing techniques like compliance/tilt corrections and determination of instrument orientation to data acquired on instruments deployed in a lake.…”

Section: S P E C I a L C O N S I D E R At I O N S F O R L A K E -B O mentioning

confidence: 99%

Surface wave imaging of the weakly extended Malawi Rift from ambient-noise and teleseismic Rayleigh waves from onshore and lake-bottom seismometers

Accardo

Gaherty

Shillington

et al. 2017

Geophysical Journal International

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“…In addition to warming air temperatures, the NENA region has experienced the greatest increase in precipitation and extreme storm events in the USA [3]. East of the Appalachians receives more precipitation; changes in the delivery of this surface or groundwater flow may be critical factors influencing deepwater temperature in this region, as has been observed in a deep, tropical lake [62]. In small, sheltered, but stratified lakes where wind mixing is minimal, water transparency may be a key modifier of deepwater trends [22,57,60].…”

Section: Deepwater Trendsmentioning

confidence: 99%

Transparency, Geomorphology and Mixing Regime Explain Variability in Trends in Lake Temperature and Stratification across Northeastern North America (1975–2014)

Richardson

Melles

Pilla

et al. 2017

Water

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Lake surface water temperatures are warming worldwide, raising concerns about the future integrity of valuable lake ecosystem services. In contrast to surface water temperatures, we know far less about what is happening to water temperature beneath the surface, where most organisms live. Moreover, we know little about which characteristics make lakes more or less sensitive to climate change and other environmental stressors. We examined changes in lake thermal structure for 231 lakes across northeastern North America (NENA), a region with an exceptionally high density of lakes. We determined how lake thermal structure has changed in recent decades and assessed which lake characteristics are related to changes in lake thermal structure. In general, NENA lakes had increasing near-surface temperatures and thermal stratification strength. On average, changes in deepwater temperatures for the 231 lakes were not significantly different than zero, but individually, half of the lakes experienced warming and half cooling deepwater temperature through time. More transparent lakes (Secchi transparency >5 m) tended to have higher near-surface warming and greater increases in strength of thermal stratification than less transparent lakes. Whole-lake warming was greatest in polymictic lakes, where frequent summer mixing distributed heat throughout the water column. Lakes often function as important sentinels of climate change, but lake characteristics within and across regions modify the magnitude of the signal with important implications for lake biology, ecology and chemistry.

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Deep-water warming trend in Lake Malawi, East Africa

Cited by 112 publications

References 9 publications

Effects of water warming on bank filtration: experimental enclosure studies

Effects of water warming on bank filtration: experimental enclosure studies

Surface wave imaging of the weakly extended Malawi Rift from ambient-noise and teleseismic Rayleigh waves from onshore and lake-bottom seismometers

Transparency, Geomorphology and Mixing Regime Explain Variability in Trends in Lake Temperature and Stratification across Northeastern North America (1975–2014)

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