Seasonality of density currents induced by differential cooling
نویسندگان
چکیده
Abstract. When lakes experience surface cooling, the shallow littoral region cools faster than deep pelagic waters. The lateral density gradient resulting from this differential cooling can trigger a cold downslope current that intrudes at base of mixed layer during stratified conditions. This process is known as thermal siphon (TS). TSs flush and increase water exchange between nearshore zones; thus, they may potentially impact lake ecosystem. Past observations in are limited to specific events. Here, we focus on seasonality TS-induced transport investigate how seasonally varying forcing conditions control occurrence intensity TSs. research interprets 1-year-long TS Rotsee (Switzerland), small wind-sheltered temperate with an elongated region. We demonstrate occur for more 50 % days late summer winter efficiently within ∼10 h. further quantify occurrence, intensity, timing over seasonal timescales. formation become optimal autumn when duration phase longer time necessary initiate TS. decrease by 1 order magnitude reduces factor 2. interpret scaling relationships relating daily averaged cross-shore velocity, unit-width discharge, flushing timescale buoyancy flux, mixed-layer depth, bathymetry. diurnal relate heating phases. increases delays maximal relative cycle. Given their scalability, results reported here be used assess relevance other reservoirs.
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ژورنال
عنوان ژورنال: Hydrology and Earth System Sciences
سال: 2022
ISSN: ['1607-7938', '1027-5606']
DOI: https://doi.org/10.5194/hess-26-331-2022