Surface energy and water vapor fluxes observed on a megadune in the Badain Jaran Desert, China

Hu, Wenfeng; Wang, Nai’ang; Zhao, Liqiang; Ning, Kai; Zhang, Xunhe

doi:10.1007/s40333-015-0129-6

Cited by 12 publications

(8 citation statements)

References 42 publications

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“…Such results point out the significantly greater ability of lakes to store energy as compared to dunes. Thus, under the unique dune-lake landscape of BJD, the difference in net radiation will inevitably lead to uneven heat distribution [47][48][49][50]. Consequently, the local air circulation between lakes and megadunes will affect the spatial distribution pattern of heat resource by way of air movements [19].…”

Section: Reason For the Warm Island Effectmentioning

confidence: 99%

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Warm Island Effect in the Badain Jaran Desert Lake Group Region Inferred from the Accumulated Temperature

Zhao

Niu

et al. 2020

Atmosphere

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The Badain Jaran Desert (BJD) is characterized by the coexistence of over 110 perennial lakes and thousands of megadunes in its southeast part. Unlike the cold island effect, we found a special phenomenon of the warm island effect in the lake group region of the BJD. However, the concept and formation mechanism remains unclear. In this study, based on observations of land surface processes in the area, we first used the daily mean temperature from 23 automated meteorological stations from 2010 to 2017 to calculate the mean daily temperature (T) ≥ 0 °C, T ≥ 10 °C accumulated temperature and negative accumulated temperature. Furthermore, using the net radiation from two eddy covariance measurement systems, characteristics of the net radiation between the lake and megadunes were analyzed. When comparing observed data in the lake group region to surrounding areas, accumulated temperature from all three meteorological stations in the lake group region were higher; the duration days of T ≥ 0 °C and T ≥ 10 °C were longer, whereas duration days of negative accumulated temperature were shorter. In addition, the initial dates for T ≥ 0 °C and T ≥ 10 °C accumulated temperature were earlier, whereas the end dates were delayed. Variations in heat were observed between stations in the lake group region that may be reflective of microclimate environments between lakes. The authors relate warm island formation in the BJD lake group region to (1) the heat carried by groundwater recharge to the desert lake groups has a great impact on the local temperature. (2) Net heat radiation to the atmosphere through sensible heat flux owing to sparse vegetation in the desert areas. Hence, heat resources are richer in the lake group region. This study aims to improve our understanding of the warm island effect from a comprehensive analysis of its intensity and distribution pattern around the lake group region as compared to its surroundings. In addition, the results from this study will provide a scientific basis for determining the source of lake water in the BJD.

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Section: Reason For the Warm Island Effectmentioning

confidence: 99%

Section: Reason For the Warm Island Effectmentioning

confidence: 99%

Warm Island Effect in the Badain Jaran Desert Lake Group Region Inferred from the Accumulated Temperature

Zhao

Niu

et al. 2020

Atmosphere

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“…Hu et al . () found that the strongest winds in the hinterland of the Badain Jaran Desert during the day and at night were 9.53 and 8.78 m/s, respectively, which suggested that the transport of aeolian sand by wind was possible. Moreover, the lake sediments are composed largely by sand and had moderately skewed grain size distribution (Table ).…”

Section: Discussionmentioning

confidence: 98%

“…No surface flow is observed because of the high ratio between evaporation and precipitation rates (Ma et al ., ; Dong et al ., ). Mean wind speed increases significantly from 3.7 m/s in the south to 4.6 m/s in the north, with the strongest winds occurring in spring (Hu et al ., ). The prevailing wind direction is northwest over the year, owing to the influence of winter monsoon from the Siberian High Pressure System (Hu and Yang, ).…”

Section: Study Areamentioning

confidence: 97%

The paleoenvironmental significance of spatial distributions of grain size in groundwater‐recharged lakes: A case study in the hinterland of the Badain Jaran Desert, northwest China

Wei

Dong

et al. 2017

Earth Surf Processes Landf

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For lakes in desert hinterlands that are not recharged by river runoff, sediment input solely comes from wind transport. While the processes of sediment transport and deposition in these lakes differ significantly from those with river discharge, the spatial distribution of sediment grain size in these groundwater‐recharged lakes remains largely unknown. Moreover, whether the grain size distribution in these lake sediments can be used as a proxy in the study of past climatic change and environmental evolution studies is unclear. In this study, five lakes with a range of surface areas that had no runoff recharge were selected from the hinterland of the Badain Jaran Desert of north‐western China, and a total of 108 samples of lake surface sediments were collected to examine the spatial distribution of grain size. Moreover, an end‐member‐modeling algorithm was used to calculate end members from all grain size measurements. Our results showed that both the median and mean grain sizes in the lake sediments decreased from the nearshore to the offshore, deep‐water zone. However, the lowest median and mean grain sizes were not found in the center of the lakes, in contrast to lakes recharged by surface runoff. The median grain size of sediment in the lake center was negatively correlated with lake level, and thus could help reveal lake evolution at low resolutions. Moreover, EM1 and EM2 were interpreted as wind transported sediment, and sediment perturbed by lake waves after wind transport, respectively. The modal grain size of EM1 varied slightly between lakes, while changes in the modal grain size of EM2 were related to lake area. Given the positive relationship found between EM2 content and lake level, changes in the EM2 content (%) can serve as a rough indicator of lake level fluctuations at low temporal resolutions. Copyright © 2017 John Wiley & Sons, Ltd.

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“…The average vertical deflection in the wind direction was -1.1°. The frequency response correction (Moncrieff et al, 2005), sonic temperature correction (Van Dijk et al, 2004) and density fluctuation correction (WPL-correction) (Webb et al, 1980) were applied (Hu et al, 2015). We also carried out a turbulence stationarity test (Foken and Wichura, 1996) and an overall turbulence characteristic test, evaluated the quality of data and divided the data according to the quality level.…”

Section: Data Quality Control and Flux Footprint Analysis Of Ecmentioning

confidence: 99%

Eddy covariance measurements of water vapor and energy flux over a lake in the Badain Jaran Desert, China

Wang

Zhao

et al. 2018

J. Arid Land

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Exploring the surface energy exchange between atmosphere and water bodies is essential to gain a quantitative understanding of regional climate change, especially for the lakes in the desert. In this study, measurements of energy flux and water vapor were performed over a lake in the Badain Jaran Desert, China from March 2012 to March 2013. The studied lake had about a 2-month frozen period (December and January) and a 10-month open-water period (February-November). Latent heat flux (LE) and sensible heat flux (Hs) acquired using the eddy covariance technique were argued by measurements of longwave and shortwave radiation. Both fluxes of longwave and shortwave radiation showed seasonal dynamics and daily fluctuations during the study period. The reflected solar radiation was much higher in winter than in other seasons. LE exhibited diurnal and seasonal variations. On a daily scale, LE was low in the morning and peaked in the afternoon. From spring (April) to winter (January), the diurnal amplitude of LE decreased slowly. LE was the dominant heat flux throughout the year and consumed most of the energy from the lake. Generally speaking, LE was mostly affected by changes in the ambient wind speed, while Hs was primarily affected by the product of water-air temperature difference and wind speed. The diurnal LE and Hs were negatively correlated in the open-water period. The variations in Hs and LE over the lake were differed from those on the nearby land surface. The mean evaporation rate on the lake was about 4.0 mm/d over the entire year, and the cumulative annual evaporation rate was 1445 mm/a. The cumulative annual evaporation was 10 times larger than the cumulative annual precipitation. Furthermore, the average evaporation rates over the frozen period and open-water period were approximately 0.6 and 5.0 mm/d, respectively. These results can be used to analyze the water balance and quantify the source of lake water in the Badain Jaran Desert.

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Surface energy and water vapor fluxes observed on a megadune in the Badain Jaran Desert, China

Cited by 12 publications

References 42 publications

Warm Island Effect in the Badain Jaran Desert Lake Group Region Inferred from the Accumulated Temperature

Warm Island Effect in the Badain Jaran Desert Lake Group Region Inferred from the Accumulated Temperature

The paleoenvironmental significance of spatial distributions of grain size in groundwater‐recharged lakes: A case study in the hinterland of the Badain Jaran Desert, northwest China

Eddy covariance measurements of water vapor and energy flux over a lake in the Badain Jaran Desert, China

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