This data set contains meteorological data, such as air temperature, pressure, rainfall intensity, relative humidity, and wind direction/speed measured by the International Centre for Integrated Mountain Development (ICIMOD).
High Mountain Asia Langtang Automatic Weather Station Measurements, Version 1
This is the most recent version of these data.
Initial release
Overview
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Citing These Data
As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.
Tsay, S. 2019. High Mountain Asia Langtang Automatic Weather Station Measurements, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/TNQV3XTMP9CP. [Date Accessed].Documentation
Data Description
This data set is closely related to High Mountain Asia Langtang Snow Properties, High Mountain Asia Langtang Snow Bidirectional Reflectance Factor, and High Mountain Asia Langtang Shortwave Downward Irradiance. All of these data sets feature point measurements that were collected on or near the Yala Glacier in Nepal.
Parameters
The parameters provided in this data set are air temperature, surface pressure, rainfall rate, relative humidity, wind direction, and wind speed. Each parameter is provided in a separate data file. The parameters are described in more detail in Table 1.
Parameter | Description | Units |
---|---|---|
AirT |
Air temperature | °C |
Pressure |
Surface pressure | hPa |
RainIntensity |
Rainfall rate | mm/h |
RH |
Relative humidity | % |
WindDirection |
Wind direction | Degrees (North = 0, clockwise) |
WindSpeed |
Wind speed | m/s |
File Information
Format
The data files are provided in Comma-Separated Values (.csv
) format. Each data file contains one of six possible parameters (see Table 1).
Naming Convention
There are six data files in this data set:
HMA_AWS_AirT_ICIMOD_BC_20171022_20181101.csv
HMA_AWS_Pressure_ICIMOD_BC_20171022_20181101.csv
HMA_AWS_RainIntensity_ICIMOD_BC_20171022_20181101.csv
HMA_AWS_RH_ICIMOD_BC_20171022_20181101.csv
HMA_AWS_WindDirection_ICIMOD_BC_20171022_20181101.csv
HMA_AWS_WindSpeed_ICIMOD_BC_20171022_20181101.csv
The files are named according to the following convention, which is described in Table 2:
HMA_AWS_[parameter]_ICIMOD_BC_20171022_20181101.csv
Variable | Description |
---|---|
HMA_AWS |
Indicates the data set High Mountain Asia Langtang Automatic Weather Station Measurements |
parameter |
Indicates one of six possible parameters (see Table 1):
|
ICIMOD_BC |
Indicates the measurement site: ICIMOD BC (see Table 3) |
20171022_20181101 |
Start and end date of collection in YYYYMMDD format |
.csv |
Indicates file type: Comma-Separated Values file |
Spatial Information
Coverage
Spatial coverage includes one location in Langtang, Nepal, as noted by the spatial extent in Table 3.
Measurement Site Name | Latitude | Longitude | Altitude |
---|---|---|---|
ICIMOD BC | 28.214° N | 85.610° E | 4901 m |
Resolution
This data set consists of one individual measurement site located in Langtang, Nepal (see Table 3).
Geolocation
Each data file contains measurements for a single site (see Table 3).
Temporal Information
Coverage
22 October 2017 to 01 November 2018
Resolution
1 s for wind speed and wind direction; 10 s for all other parameters
Data Acquisition and Processing
Acquisition and Processing
Meteorological data are measured by a commercial weather sensor (Lufft WS700) and a visibility sensor (Biral Visibility Sensor SWS100) operated by ICIMOD.
Instrumentation
The data were collected using an automatic weather station (AWS).
Software and Tools
The data files can be opened in any program. However, they are best viewed through a spreadsheet program, such as Microsoft Excel, OpenOffice Calc, or Google Docs.
Related Data Sets
High Mountain Asia Langtang Snow Properties
High Mountain Asia Langtang Snow Bidirectional Reflectance Factor
High Mountain Asia Langtang Shortwave Downward Irradiance
High Mountain Asia at NSIDC | Data Sets
Related Websites
High Mountain Asia at NSIDC | Overview
NASA High Mountain Asia Project
NASA Research Announcement: Understanding Changes in High Mountain Asia
Contacts
Si-Chee Tsay
NASA's Goddard Space Flight Center (GSFC)
Acknowledgments
The data providers are grateful to the NASA MODIS Adaptive Processing System (MODAPS) for processing the satellite data sets used in this product; the Calibration Facility Laboratory (GSFC/Code 618) for their support in calibrating the SMART-r units; and Milton G. Hom at SSAI/GSFC (Code 618) for the reflectance standards of the BRF measurements. The providers also sincerely acknowledge the International Centre for Integrated Mountain Development (ICIMOD) in Kathmandu, Nepal, for logistics support, field site identification, and operating collocated instruments, as well as data sharing. Sincere thanks are also given to all assistants and graduate students operating the sites under harsh environmental conditions and for their technical support, which helped make the field campaigns successful.
References
Ji, Q., Tsay, S.-C., Lau, K. M., Hansell, R. A., Butler, J. J., & Cooper, J. W. (2011). A novel nonintrusive method to resolve the thermal dome effect of pyranometers: Radiometric calibration and implications. Journal of Geophysical Research: Atmospheres, 116(D24), n/a-n/a. https://doi.org/10.1029/2011jd016466