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Discussion papers | Copyright
https://doi.org/10.5194/essd-2018-58
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Brief communication 06 Aug 2018

Brief communication | 06 Aug 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).

A database of water and heat observations over grassland in the north-east of Japan

Wenchao Ma1, Jun Asanuma1,2, Jianqing Xu3, and Yuichi Onda1,2 Wenchao Ma et al.
  • 1Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, Tsukuba, 305-8577, Japan
  • 2Facu lty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, 305-8577, Japan
  • 3Col leg e of Business Administration, Kanto Gakuin University, Yokohama, 236-0037, Japan

Abstract. A highly valuable database of long-term hydro–meteorological measurements is presented, containing in situ observations for a period of 37 years from well-maintained grassland in the north-east of Japan. The observations include the shortwave radiation, net radiation, the air and dew point temperatures at three elevations, the soil temperature at four depths, the sensible heat flux, soil heat flux, wind speed, relative humidity, air pressure and precipitation. The heights of measurements are 1.6m, 12.5m and 29.5m above ground, with the soil-layer observations at depths of −0.02m, −0.1m, −0.5m and −1m. This high-quality database includes the four temporal resolutions of 10s, 0.5h, 1h and 24h, with the hourly data presented here. The monthly and annual statistics are presented at the database web page of the Center for Research in Isotopes and Environmental Dynamics and Prediction of the University of Tsukuba, http://doi.org/10.24575/0001.198108 . We have validated the data quality by comparing with published data from the local meteorological agency in Tateno operated by the Japan Metrological Agency, including the average, maximum and minimum values of air temperature, shortwave radiation, wind speed, relative humidity, and precipitation. We have generated a daily downward longwave radiation time series with a method developed by Konto and Xu (1997) based on the observations from the database. This constructed time series agrees well with observations collected between 2002 to 2006, as evaluated based on the values of the Nash–Sutcliffe efficiency (=0.947) and the percent bias (=1.486). For the whole database, annually averaged values give an obvious positive trend in the precipitation, air temperature, shortwave radiation, net radiation and sensible heat flux over the previous 37 years, with a negative trend detected for the wind speed, soil heat flux and soil temperature.

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A database of water and heat observations over grassland in the north-east of Japan W. Ma, J. Asanuma, J. Xu, and Y. Onda https://doi.org/10.24575/0001.198108

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