潮汐抽水和潮间带地下水泉在一个沿海泻湖中产生了明显的时空热变化

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Kathryn A. Smith, Jeffrey M. McKenzie, Barret L. Kurylyk
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引用次数: 0

摘要

潮间带地下涌泉提供热稳定、营养丰富的淡水,导致水温和盐度的微尺度变化,并促进沿岸河口和泻湖的生物多样性。在这项研究中,我们结合了三种热感应技术,以阐明加拿大爱德华王子岛潮间带地下水泉口和周围沿海泻湖的夏季水温模式。热红外图像捕捉了泻湖河道和泉水冷水羽流相对温度的时空变化。在整个潮汐周期中都能在地表检测到由泉水引起的热异常,这表明热羽流具有浮力。光纤分布式温度传感器与泉水出口附近的温度记录仪配对,记录到退潮时的地下水温度(约 7°C),但由于分层水体中的垂直热梯度,涨潮时的泻湖环境温度(高达 26°C)。在整个研究过程中计算得出的河口理查德森数证实,潮间带泉水浮力是由盐度差异引起的。光纤分布式温度传感结果表明,研究期间电缆长度上的空间(3.7°C)和时间(5.5°C)标准偏差显示温度有明显变化,由于潮汐抽水的热量平流,涨潮时泻湖湖床平均水温(22.5°C)低于落潮时(24.3°C)。泻湖温度以昼夜(日照)和半昼夜(潮汐)频率波动。这些发现强调了采用多技术方法揭示驱动沿岸泻湖生态系统温度模式和生境分布的精细和动态热过程的有效性,并突出了潮间带泉水的热影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Tidal pumping and intertidal groundwater springs create pronounced spatiotemporal thermal variability in a coastal lagoon

Tidal pumping and intertidal groundwater springs create pronounced spatiotemporal thermal variability in a coastal lagoon

Intertidal groundwater springs provide thermally stable, nutrient-rich freshwater that causes fine-scale variability in water temperature and salinity and promotes biodiversity in coastal estuaries and lagoons. In this study, we combined three thermal sensing techniques to elucidate summer water temperature patterns at the mouths of intertidal groundwater springs and the ambient coastal lagoon in Prince Edward Island, Canada. Thermal infrared imagery captured the spatiotemporal variability in relative temperatures of the lagoon channel and cold-water plumes from the springs. Thermal anomalies due to the springs were detected at the surface throughout a tidal cycle, suggesting that the thermal plumes were buoyant. Fiber-optic distributed temperature sensing paired with temperature loggers near the spring outlets recorded groundwater temperatures at low tide (~ 7°C) but ambient lagoon temperatures (up to 26°C) at high tide due to the vertical thermal gradient in the stratified water column. Calculated estuarine Richardson numbers throughout the study confirm intertidal spring buoyancy due to salinity differences. The fiber-optic distributed temperature sensing results revealed pronounced variations in temperature as evidenced by spatial (3.7°C) and temporal (5.5°C) standard deviations over the cable length during the study and lower mean lagoon bed water temperatures at high tide (22.5°C) than low tide (24.3°C) due to heat advection from tidal pumping. Lagoon temperatures fluctuate at diurnal (solar) and semi-diurnal (tidal) frequencies. The findings emphasize the efficacy of a multi-technology approach to reveal fine-scale and dynamic thermal processes that drive temperature patterns and habitat distribution in coastal lagoon ecosystems and highlight the thermal influence of intertidal springs.

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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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