Abstract
Among several influential factors, the geographical position and depth of a lake determine its thermal structure. In temperate zones, shallow lakes show significant differences in thermal stratification compared to deep lakes. Here, the variation in thermal stratification in Lake Taihu, a shallow fresh water lake, is studied systematically. Lake Taihu is a warm polymictic lake whose thermal stratification varies in short cycles of one day to a few days. The thermal stratification in Lake Taihu has shallow depths in the upper region and a large amplitude in the temperature gradient, the maximum of which exceeds 5°C m–1. The water temperature in the entire layer changes in a relatively consistent manner. Therefore, compared to a deep lake at similar latitude, the thermal stratification in Lake Taihu exhibits small seasonal differences, but the wide variation in the short term becomes important. Shallow polymictic lakes share the characteristic of diurnal mixing. Prominent differences on the duration and frequency of long-lasting thermal stratification are found in these lakes, which may result from the differences of local climate, lake depth, and fetch. A prominent response of thermal stratification to weather conditions is found, being controlled by the stratifying effect of solar radiation and the mixing effect of wind disturbance. Other than the diurnal stratification and convection, the representative responses of thermal stratification to these two factors with contrary effects are also discussed. When solar radiation increases, stronger wind is required to prevent the lake from becoming stratified. A daily average wind speed greater than 6 m s–1 can maintain the mixed state in Lake Taihu. Moreover, wind-induced convection is detected during thermal stratification. Due to lack of solar radiation, convection occurs more easily in nighttime than in daytime. Convection occurs frequently in fall and winter, whereas long-lasting and stable stratification causes less convection in summer.
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References
Berger, S. A., S. Diehl, H. Stibor, et al., 2007: Water temperature and mixing depth affect timing and magnitude of events during spring succession of the plankton. Oecologia, 150, 643–654, doi: 10.1007/s00442-006-0550-9.
Boehrer, B., and M. Schultze, 2008: Stratification of lakes. Rev. Geophys., 46, RG2005, doi: 10.1029/2006RG000210.
Chai, A., and E. Kit, 1991: Experiments on entrainment in an annulus with and without velocity gradient across the density interface. Exp. Fluids, 11, 45–57, doi: 10.1007/BF00198431.
Cheng, X., Y. W. Wang, C. Hu, et al., 2016: The lake–air exchange simulation of a lake model over eastern Taihu Lake based on the E–ε turbulent kinetic energy closure thermodynamic process. Acta Meteor. Sinica, 74, 633–645, doi: 10.11676/qxxb2016.043. (in Chinese)
Chu, C. R., and C. K. Soong, 1997: Numerical simulation of windinduced entrainment in a stably stratified water basin. J. Hydraul. Res., 35, 21–42, doi: 10.1080/00221689709498642.
Chu, P. C., and C. W. Fan, 2011: Maximum angle method for determining mixed layer depth from seaglider data. J. Oceanogr., 67, 219–230, doi: 10.1007/s10872-011-0019-2.
Churchill, J. H., and W. C. Kerfoot, 2007: The impact of surface heat flux and wind on thermal stratification in Portage Lake, Michigan. J. Great Lakes Res., 33, 143–155, doi: 10.3394/0380-1330(2007)33[143:TIOSHF]2.0.CO;2.
Condie, S. A., and I. T. Webster, 2002: Stratification and circulation in a shallow turbid waterbody. Environ. Fluid Mech., 2, 177–196, doi: 10.1023/A:1019898931829.
Crawford, G. B., and R. W. Collier, 1997: Observations of a deepmixing event in Crater Lake, Oregon. Limnol. Oceanogr., 42, 299–306, doi: 10.4319/lo.1997.42.2.0299.
Deng, B., S. D. Liu, W. Xiao, et al., 2013: Evaluation of the CLM4 Lake Model at a large and shallow freshwater lake. J. Hydrometeorol., 14, 636–649, doi: 10.1175/JHM-D-12-067.1.
Farrow, D. E., and C. L. Stevens, 2003: Numerical modelling of a surface-stress driven density-stratified fluid. J. Eng. Math., 47, 1–16, doi: 10.1023/A:1025519724504.
Fee, E. J., R. E. Hecky, S. E. M. Kasian, et al., 1996: Effects of lake size, water clarity, and climatic variability on mixing depths in Canadian Shield Lakes. Limnol. Oceanogr., 41, 912–920, doi: 10.4319/lo.1996.41.5.0912.
Fonseca, B. M., and C. E. de M. Bicudo, 2008: Phytoplankton seasonal variation in a shallow stratified eutrophic reservoir (Garças Pond, Brazil). Hydrobiologia, 600, 267–282, doi: 10.1007/s10750-007-9240-9.
Giles, C. D., P. D. F. Isles, T. Manley, et al., 2016: The mobility of phosphorus, iron, and manganese through the sediment-water continuum of a shallow eutrophic freshwater lake under stratified and mixed water-column conditions. Biogeochemistry, 127, 15–34, doi: 10.1007/s10533-015-0144-x.
Godo, T., K. Kato, H. Kamiya, et al., 2001: Observation of windinduced two-layer dynamics in Lake Nakaumi, a coastal lagoon in Japan. Limnology, 2, 137–143, doi: 10.1007/s102010170009.
Gonçalves, M. A., F. C. Garcia, and G. F. Barroso, 2016: Morphometry and mixing regime of a tropical lake: Lake Nova (Southeastern Brazil). An. Acad. Bras. Cienc., 88, 1341–1356, doi: 10.1590/0001-3765201620150788.
Heo, K.-Y., and K.-J. Ha, 2010: A coupled model study on the formation and dissipation of sea fogs. Mon. Wea. Rev., 138, 1186–1205, doi: 10.1175/2009MWR3100.1.
Hu, W. P., S. E. Jørgensen, Z. Fabing, et al., 2011: A model on the carbon cycling in Lake Taihu, China. Ecol. Model., 222, 2973–2991, doi: 10.1016/j.ecolmodel.2011.04.018.
Kalff, J., 2002: Temperature cycles, lake stratification, and heat budgets. Limnology: Inland Water Ecosystems, J. Kalff, Ed. Prentice Hall, Upper Saddle River, N. J., 592 pp.
Kara, A. B., P. A. Rochford, and H. E. Hurlburt, 2000: An optimal definition for ocean mixed layer depth. J. Geophys. Res., 105, doi: 10.1029/2000JC900072.
Lee, X. H., S. D. Liu, W. Xiao, et al., 2014: The Taihu Eddy Flux Network: An observational program on energy, water, and greenhouse gas fluxes of a large freshwater lake. Bull. Amer. Meteor. Soc., 95, 1583–1594, doi: 10.1175/BAMS-D-13-00136.1.
Lewis, W. M., Jr., 1983: A revised classification of lakes based on mixing. Can. J. Fish. Aquat. Sci., 40, 1779–1787, doi: 10.1139/f83-207.
Liu, H. Z., J. W. Feng, J. H. Sun, et al., 2015: Eddy covariance measurements of water vapor and CO2 fluxes above the Erhai Lake. Sci. China Earth Sci., 58, 317–328, doi: 10.1007/s11430-014-4828-1.
Michalski, J., and U. Lemmin, 1995: Dynamics of vertical mixing in the hypolimnion of a deep lake: Lake Geneva. Limnol. Oceanogr., 40, 809–816, doi: 10.4319/lo.1995.40.4.0809.
Monterey, G., and S. Levitus, 1997: Seasonal Variability of Mixed Layer Depth for the World Ocean. NOAA Atlas NESDIS 14, Washington, D.C., U.S. Government Printing Office, 96 pp.
Oswald, C. J., and W. R. Rouse, 2004: Thermal characteristics and energy balance of various-size Canadian shield lakes in the Mackenzie River Basin. J. Hydrometeorol., 5, 129–144, doi: 10.1175/1525-7541(2004)005<0129:TCAEBO>2.0.CO;2.
Pernica, P., M. G. Wells, and S. MacIntyre, 2014: Persistent weak thermal stratification inhibits mixing in the epilimnion of north-temperate Lake Opeongo, Canada. Aquat. Sci., 76, 187–201, doi: 10.1007/s00027-013-0328-1.
Qin, B. Q., P. Z. Xu, Q. L. Wu, et al., 2007: Environmental issues of Lake Taihu, China. Hydrobiologia, 581, 3–14, doi: 10.1007/s10750-006-0521-5.
Qiu, Y. Y., 2013: Numerical simulation study of the effect of underlying surface obstacles on observation environment. Master Degree dissertation, Nanjing University of Information Science & Technology, China, 53 pp. (in Chinese)
Samal, N. R., K. D. Jöhnk, F. Peeters, et al., 2008: Mixing and internal waves in a small stratified Indian lake: Subhas Sarobar. Monitoring and Modelling Lakes and Coastal Environments. P. K. Mohanty, Ed., Springer Publishing, Berlin, 91–100.
Schadlow, S. G., and D. P. Hamilton, 1995: Effect of major flow diversion on sediment nutrient release in a stratified reservoir. Mar. Freshwater Res., 46, 189–195, doi: 10.1071/MF9950189.
Socolofsky, S. A., and G. H. Jirka, 2005: Mixing in lakes and reservoirs. Special Topics in Mixing and Transport Processes in the Environment. S. A. Socolofsky, and G. H. Jirka, Eds., College Station, TX, Texas A&M University, 230 pp.
Sprintall, J., and M. Tomczak, 1992: Evidence of the barrier layer in the surface layer of the tropics. J. Geophys. Res., 97, 7305–7316, doi: 10.1029/92JC00407.
Sun, S. F., J. F. Yan, N. Xia, et al., 2007: Development of a model for water and heat exchange between the atmosphere and a water body. Adv. Atmos. Sci., 24, 927–938, doi: 10.1007/s00376-007-0927-7.
Tuan, N. V., K. Hamagami, K. Mori, et al., 2009: Mixing by windinduced flow and thermal convection in a small, shallow and stratified lake. Paddy Water Environ., 7, 83–93, doi: 10.1007/s10333-009-0158-x. von
Einem, J., and W. Granéli, 2010: Effects of fetch and dissolved organic carbon on epilimnion depth and light climate in small forest lakes in southern Sweden. Limnol. Oceanogr., 55, 920–930, doi: 10.4319/lo.2010.55.2.0920.
Wang, M. D., J. Z. Hou, and Y. B. Lei, 2014: Classification of Tibetan Lakes based on variations in seasonal lake water temperature. Chinese Sci. Bull., 59, 4847–4855, doi: 10.1007/s11434-014-0588-8.
Wang, S., X. Qian, B. P. Han, et al., 2012: Effects of local climate and hydrological conditions on the thermal regime of a reservoir at tropic of cancer, in southern China. Water Res., 46, 2591–2604, doi: 10.1016/j.watres.2012.02.014.
Wang, W., 2014: Energy budget at Lake Taihu and its response to climate change. Ph.D. dissertation, Nanjing University of Information Science & Technology, China, 140 pp. (in Chinese)
Wilhelm, S., and R. Adrian, 2008: Impact of summer warming on the thermal characteristics of a polymictic lake and consequences for oxygen, nutrients and phytoplankton. Freshw. Biol., 53, 226–237, doi: 10.1111/j.1365-2427.2007.01887.x.
Zhang, L., B. Zhu, J. H. Gao, et al., 2017: Impact of Taihu Lake on city ozone in the Yangtze River Delta. Adv. Atmos. Sci., 34, 226–234, doi: 10.1007/s00376-016-6099-6.
Zhang, Y. L., Z. X. Wu, M. L. Liu, et al., 2014: Thermal structure and response to long-term climatic changes in Lake Qiandaohu, a deep subtropical reservoir in China. Limnol. Oceanogr., 59, 1193–1202, doi: 10.4319/lo.2014.59.4.1193.
Zhao, L. L., G. W. Zhu, Y. F. Chen, et al., 2011: Thermal stratification and its influence factors in a large-sized and shallow lake Taihu. Adv. Water Sci., 22, 844–850. (in Chinese)
Zhao, Q. H., J. H. Sun, and G. W. Zhu, 2012: Simulation and exploration of the mechanisms underlying the spatiotemporal distribution of surface mixed layer depth in a large shallow lake. Adv. Atmos. Sci., 29, 1360–1373, doi: 10.1007/s00376-012-1262-1.
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Supported by the National Natural Science Foundation of China (41275024, 41575147, 41505005, and 41475141), Natural Science Foundation of Jiangsu Province (BK20150900), Startup Funds for Introduced Talents of Nanjing University of Information Science & Technology (2014r046), Ministry of Education of China grant PCSIRT, and Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Yang, Y., Wang, Y., Zhang, Z. et al. Diurnal and Seasonal Variations of Thermal Stratification and Vertical Mixing in a Shallow Fresh Water Lake. J Meteorol Res 32, 219–232 (2018). https://doi.org/10.1007/s13351-018-7099-5
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DOI: https://doi.org/10.1007/s13351-018-7099-5