The GRDC re-calculated in 2014 the Global Freshwater Fluxes into the World Oceans based on results from the global hydrological model WaterGAP (Doell et al., 2003) for 0.5° grid cell resolution. The annual and long-term means of freshwater fluxes calculated for land areas associated with the UNEP GIWA Regions (UNEP, 2014) are displayed and as well freshwater fluxes from the 5° cells along the continent's coastlines. Freshwater fluxes calculated per 5° and 10° latitude bands show how much freshwater flows from a specific area into a specific ocean.
The UZDL99 TTAAii Data Designators decode as: T1 (U): Upper air data T1T2 (UZ): Upper level pressure, temperature, humidity and wind from a sonde released by carrier balloon or aircraft (Parts A, B, C, D) A1A2 (DL): Germany (Remarks from Volume-C: CAMPAGNE DATA FROM BARBADOS ESTIMATED JAN 20 - FEB 17, 2020)
The Long-Term Mean Monthly Discharges and Annual Characteristics offer basic statistics of all stations being represented in the Global Runoff Database: - annual means, lowest, and highest monthly discharges for individual years, - long-term mean, lowest, and highest monthly discharges of time series with at least five years of observation each with at least ten monthly values, - long-term inner-annual mean, lowest and highest monthly discharges of time series with at least five values of a specific month, and their standard deviations. The monthly primary values are provided station by station as ASCII-text files, named with pvm-prefix and station numbers. For download, all files are grouped by WMO Regions. Please note, that statistics are only provided for timeseries of daily discharge values from years with less than ten months and months with less than ten days missing.
The Global Terrestrial Network for River Discharge (GTN-R) is a component of the Global Terrestrial Network - Hydrology (GTN-H) supported by Global Climate Observing system (GCOS) and the Hydrology and Water Resources Programme of the WMO (HWRP). The basic idea of the GTN-R project is to draw together the already available real-time discharge data provided by the National Hydrological Services (NHS) and to redistribute it in a standardised way. Core component is the GCOS Baseline River Network of gauging stations located near to the mouth of the World's major rivers. In cooperation with the Hydrological Services of the WMO Member States this network is constantly being extended by confirmation of additional stations. The GCOS Baseline River Network is a project in progress with a current status as of December 2014 of 245 gauging stations worldwide. GRDC contributes to the GTN-H by the collection of river discharge data of these so-called GTN-R stations. As a first step, the data of daily river discharge at the GRDC stations corresponding to the GCOS Baseline River Network are provided to the public via the Geoportal of the German Federal Institute for Hydrology (BfG) using a standard Sensor Observation Service (SOS). The provision via the GEOSS Portal is intended (further details will be communicated in due time):
Time series of daily and/or monthly river discharge data of more than 9200 stations from 160 countries, comprising around 390,000 station-years with an average time series length of about 42 years. The earliest daily data are from the year 1806, the most recent from the year 2016.
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