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Understanding Lake Tanganyika: Insights into Climate, Circulation Dynamics, and Fishery Productivity Across Time Using Paleolimnological and Modeling Approaches
Understanding Lake Tanganyika: Insights into Climate, Circulation Dynamics, and Fishery Productivity Across Time Using Paleolimnological and Modeling Approaches
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105639
- ISBN
- 9798270225896
- DDC
- 363
- 서명/저자
- Understanding Lake Tanganyika: Insights into Climate, Circulation Dynamics, and Fishery Productivity Across Time Using Paleolimnological and Modeling Approaches
- 발행사항
- [Sl] : The University of Arizona, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 146 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Russell, Joellen.
- 학위논문주기
- Thesis (Ph.D.)--The University of Arizona, 2025.
- 초록/해제
- 요약Lake Tanganyika, one of the world's most biodiverse freshwater lakes and a vital resource for local fisheries, faces significant threats from climate change that jeopardize its ecological integrity and the livelihoods of dependent communities. This dissertation investigates the lake's thermal dynamics, circulation patterns, and historical limnological conditions using the Regional Ocean Modeling System (ROMS) and sediment core analyses. Our simulations show seasonal surface temperatures between ~25.8°C and ~27.8°C, consistent with observations, along with a concerning increase of up to 0.4°C at depths below 150 meters from 2001 to 2020. Primary upwelling occurs in the southern region during the dry season, while secondary upwelling occurs in the northern region during the wet season. Notably, there is previously unrecognized downwelling on the west side of the lake during September to November. Sediment core analyses reveal a warming trend since ~1850 AD, highlighting long-term climate change impacts on the lake's ecosystem. These trends correlate with global climate patterns, raising concerns about future effects on lake stratification and fishery yields. Enhanced productivity in pelagic zones is linked to deep vertical mixing, while productivity in littoral zones is influenced by increased riverine input during wetter phases. Under high-emission climate scenarios projected through 2100, lake surface temperatures could rise by up to 3.9°C, leading to significant changes in isotherm depths and thermal stratification, which may disrupt nutrient transport and adversely affect fish populations that provide approximately 40% of animal protein for local communities. Our findings emphasize the role of hydrodynamic and atmospheric interactions on nutrient distribution and ecological dynamics. They highlight the urgent need for adaptive management strategies, including community involvement in monitoring and international collaboration, to mitigate climate change impacts on Lake Tanganyika's ecosystem. This research offers valuable insights into the interplay between climate, hydrology, and biological productivity, informing strategies to preserve the ecological balance of Lake Tanganyika and support the livelihoods of millions reliant on its resources.
- 일반주제명
- Climate change
- 일반주제명
- Paleoclimate science
- 일반주제명
- Physical oceanography
- 일반주제명
- Paleoecology
- 키워드
- Fisheries
- 키워드
- Lake modeling
- 키워드
- Paleolimnology
- 기타저자
- The University of Arizona Geosciences
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105639
■006m o d
■007cr#unu||||||||
■020 ▼a9798270225896
■035 ▼a(MiAaPQ)AAI32396272
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a363
■1001 ▼aKamulali, Tumaini M.
■24510▼aUnderstanding Lake Tanganyika: Insights into Climate, Circulation Dynamics, and Fishery Productivity Across Time Using Paleolimnological and Modeling Approaches
■260 ▼a[Sl]▼bThe University of Arizona▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a146 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisor: Russell, Joellen.
■5021 ▼aThesis (Ph.D.)--The University of Arizona, 2025.
■520 ▼aLake Tanganyika, one of the world's most biodiverse freshwater lakes and a vital resource for local fisheries, faces significant threats from climate change that jeopardize its ecological integrity and the livelihoods of dependent communities. This dissertation investigates the lake's thermal dynamics, circulation patterns, and historical limnological conditions using the Regional Ocean Modeling System (ROMS) and sediment core analyses. Our simulations show seasonal surface temperatures between ~25.8°C and ~27.8°C, consistent with observations, along with a concerning increase of up to 0.4°C at depths below 150 meters from 2001 to 2020. Primary upwelling occurs in the southern region during the dry season, while secondary upwelling occurs in the northern region during the wet season. Notably, there is previously unrecognized downwelling on the west side of the lake during September to November. Sediment core analyses reveal a warming trend since ~1850 AD, highlighting long-term climate change impacts on the lake's ecosystem. These trends correlate with global climate patterns, raising concerns about future effects on lake stratification and fishery yields. Enhanced productivity in pelagic zones is linked to deep vertical mixing, while productivity in littoral zones is influenced by increased riverine input during wetter phases. Under high-emission climate scenarios projected through 2100, lake surface temperatures could rise by up to 3.9°C, leading to significant changes in isotherm depths and thermal stratification, which may disrupt nutrient transport and adversely affect fish populations that provide approximately 40% of animal protein for local communities. Our findings emphasize the role of hydrodynamic and atmospheric interactions on nutrient distribution and ecological dynamics. They highlight the urgent need for adaptive management strategies, including community involvement in monitoring and international collaboration, to mitigate climate change impacts on Lake Tanganyika's ecosystem. This research offers valuable insights into the interplay between climate, hydrology, and biological productivity, informing strategies to preserve the ecological balance of Lake Tanganyika and support the livelihoods of millions reliant on its resources.
■590 ▼aSchool code: 0009.
■650 4▼aClimate change
■650 4▼aPaleoclimate science
■650 4▼aPhysical oceanography
■650 4▼aPaleoecology
■653 ▼aFisheries
■653 ▼aLake modeling
■653 ▼aPaleolimnology
■653 ▼aEcological integrity
■653 ▼aRegional Ocean Modeling System
■690 ▼a0404
■690 ▼a0653
■690 ▼a0415
■690 ▼a0426
■71020▼aThe University of Arizona▼bGeosciences.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a0009
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360928▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
