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Official reference number service contract: C3S2 311 Lot3
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Related documents
| Reference ID | Document | ||||||
|---|---|---|---|---|---|---|---|
D1
| NGCD Algorithm Theoretical Basis Document | ||||||
D2
| NGCD Product User Guide and Specifications (PUGS) | ||||||
D3
| Climate and Forecast (CF) Conventions and Metadata; http://cfconventions.org | ||||||
D4
| R Core Team (2017). R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. URL https://www.R-project.org/ |
Acronyms
Acronym | Definition |
CDS | |
MET Norway | |
KNMI | |
NGCD | Nordic Gridded Climate Dataset (DOI:https://doi.org/10.24381/cds.e8f4a10c |
NGCD-1 | NGCD type 1 datasets |
NGCD-2 | NGCD type 2 datasets |
ECA&D |
Data access information
Anchor table_data_access table_data_access
| Description | Link |
|---|---|
| NGCD climate indices ver. 23.03 (full update based on NGCD historical archive) | https://thredds.met.no/thredds/catalog/ngcd/version_23.03/indices/catalog.html |
| NGCD climate indices ver. 22.03 (full update based on NGCD historical archive) | https://thredds.met.no/thredds/catalog/ngcd/version_22.03/indices/catalog.html |
| NGCD climate indices provisional ver. 23.03 (monthly updates based on NGCD provisional archive) | https://thredds.met.no/thredds/catalog/ngcd/provisional/indices/catalog.html |
| NGCD is available to users via the Climate Data Store | https://cds.climate.copernicus.eu/ |
| datasets/insitu-gridded-observations-nordic?tab=overview | |
| NGCD is also available to users via MET Norway OPeNDAP access | https://thredds.met.no/thredds/catalog/ngcd/catalog.html |
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Table 1: Overview of key characteristics of the indices derived from NGCD
Data Description | |
Dataset title | Indices derived from NGCD |
Data type | Indicators derived from gridded observations |
Topic category | Climate Monitoring |
Sector | Applicable to various sectors |
Keyword | Climate indices |
Dataset language | eng |
Domain | Finland, Norway and Sweden |
Horizontal resolution | 1 km x 1 km |
Temporal coverage | 1971-01-01/to/2022-12-31 |
Temporal resolution | Monthly / seasonal / half-yearly / annual / daily (depending on the index) |
Update frequency | Annual (in June) |
Version | ver. 23.03 (based on NGCD ver 23.03) |
Provider | the Norwegian Meteorological Institute (MET Norway) |
Terms of Use | The NGCD based Climate Indices as a derived dataset can be provided under the Copernicus licence. |
Variable Description
Anchor tab2 tab2
Table 2: Overview and description of variables.
| Variables | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Long Name | Short Name | Unit | Type | Description | ||||||||||||||||
Number of Frost Days | FD | Days | Cold | The number of days in a given period when the daily minimum temperature is less than 0°C. | ||||||||||||||||
Maximum number of consecutive frost days | CFD | Days | Cold | The largest number of consecutive days in a given period when the daily minimum temperature is less than 0°C. | ||||||||||||||||
Number of Ice Days | ID | Days | Cold | The number of days in a given period when the daily maximum temperature is less than 0°C. | ||||||||||||||||
Heating degree days | HD17 | °C | Cold | The heating degree days index accumulates the temperature difference between daily mean temperature TG and the threshold of 17°C (17°C−TG), for the days when the daily mean temperature drops below 17°C, for a given period. | ||||||||||||||||
Growing season length | GSL | Days | Cold | The number of days between the first occurrence of at least 6 consecutive days when the daily mean temperature exceeds 5°C and the first occurrence after 1 July of at least 6 consecutive days when the daily mean temperature drops below 5°C. | ||||||||||||||||
Minimum value of daily maximum temperature | TXn | °C | Cold | The minimum value of the daily maximum temperatures in a given period. | ||||||||||||||||
Minimum value of daily minimum temperature | TNn | °C | Cold | The minimum value of the daily minimum temperatures in a given period. | ||||||||||||||||
Percentage of cold nights | TN10p | % | Cold | The percentage of days in a given period when the daily minimum temperature is less than the 10th percentile of daily minimum temperatures for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990. | ||||||||||||||||
Percentage of cold day-times | TX10p | % | Cold | The percentage of days in a given period when the daily maximum temperature is less than the 10th percentile of daily maximum temperatures for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990. | ||||||||||||||||
Cold-spell duration index | CSDI* | Days | Cold | The largest number of consecutive days in a given period when the daily minimum temperature is less than the 10th percentile of daily minimum temperatures for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990, in intervals of at least six consecutive days. | ||||||||||||||||
Number of Summer days | SU | Days | Heat | The number of days in a given period when the daily maximum temperature is higher than 25°C. | ||||||||||||||||
Maximum number of consecutive summer days | CSU | Days | Heat | The largest number of consecutive days in a given period when the daily maximum temperature is higher than 25°C. | ||||||||||||||||
Number of Tropical nights | TR | Days | Heat | The number of days in a given period when the daily minimum temperature is higher than 20°C. | ||||||||||||||||
Maximum value of daily maximum temperature | TXx | °C | Heat | The maximum value of the daily maximum temperatures in a given period. | ||||||||||||||||
Maximum value of daily minimum temperature | TNx | °C | Heat | The maximum value of the daily minimum temperatures in a given period. | ||||||||||||||||
Percentage of warm nights | TN90p | % | Heat | The percentage of days in a given period when the daily minimum temperature is higher than the 90th percentile of daily minimum temperatures for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990. | ||||||||||||||||
Percentage of warm day-times | TX90p | % | Heat | The percentage of days in a given period when the daily maximum temperature is higher than the 90th percentile of daily maximum temperatures for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990. | ||||||||||||||||
Warm-spell duration index | WSDI* | Days | Heat | The largest number of consecutive days in a given period when the daily maximum temperature is higher than the 90th percentile of daily maximum temperatures for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990, in intervals of at least six consecutive days. | ||||||||||||||||
Mean of diurnal temperature range | DTR | °C | Multi | The mean value in a given period of the difference between the daily maximum temperature and daily minimum temperature (daily maximum - daily minimum). | ||||||||||||||||
Maximum number of consecutive dry days (daily precipitation < 1 mm) | CDD* | Days | Drought | The largest number of consecutive days in a given period when the daily precipitation is less than 1 mm. | ||||||||||||||||
Huglin Index for grape growth suitability | HI | [-] | Multi | The Huglin index accumulates the mean of the temperature difference between the daily mean temperature (TG) and the threshold of 10°C (TG - 10°C), and the temperature difference between the daily maximum temperature (TX) and the threshold of 10°C (TX - 10°C), for the days when the daily mean temperature exceeds 10°C. The accumulation is multiplied by a latitudinal coefficient for day length, K. The period of accumulation is 1 April to 30 September. The value of K is determined using:
Each specific grape variety has a specific range of Huglin Index values for which it thrives (https://en.wikipedia.org/wiki/Huglin_index). | ||||||||||||||||
3-Month Standardized Precipitation Index | SPI-3 | [-] | Drought | SPI is a probability index based on precipitation. It is designed to be a spatially invariant indicator of drought. SPI3 refers to precipitation in the previous 3-month period (positive values indicate a wet period; negative values indicate a dry period). | ||||||||||||||||
6-Month Standardized Precipitation Index | SPI-6 | [-] | Drought | SPI is a probability index based on precipitation. It is designed to be a spatially invariant indicator of drought. SPI6 refers to precipitation in the previous 6-month period (positive values indicate a wet period; negative values indicate a dry period). | ||||||||||||||||
Highest 1-day precipitation amount | RX1day | mm | Rain | The maximum value of the one-day precipitation amount in a given period. | ||||||||||||||||
Highest 3-day precipitation amount | RX3day | mm | Rain | The maximum value of the consecutive three-day precipitation amount in a given period. | ||||||||||||||||
Highest 5-day precipitation amount | RX5day | mm | Rain | The maximum value of the consecutive five-day precipitation amount in a given period. | ||||||||||||||||
Simple daily intensity index | SDII | mm/day | Rain | The mean value of daily precipitation amount on wet days (when the daily precipitation is equal to or larger than 1 mm) in a given period. | ||||||||||||||||
Number of Wet days | R1mm | Days | Rain | The number of days in a given period when the daily precipitation amount is equal to or larger than 1 mm. | ||||||||||||||||
Number of Heavy precipitation days | R10mm | Days | Rain | The number of days in a given period when the daily precipitation amount is equal to or larger than 10 mm. | ||||||||||||||||
Number of Very heavy precipitation days | R20mm | Days | Rain | The number of days in a given period when the daily precipitation amount is equal to or larger than 20 mm. | ||||||||||||||||
Maximum no of consecutive wet days | CWD* | Days | Rain | The largest number of consecutive days in a given period when the daily precipitation amount is equal to or is larger than 1 mm. | ||||||||||||||||
Precipitation fraction due to moderate wet days | R75pFRAC | % | Rain | The percentage of days in a given period when the daily precipitation amount is higher than the 75th percentile of the daily precipitation amounts for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990. | ||||||||||||||||
Precipitation fraction due to very wet days | R95pFRAC | % | Rain | The percentage of days in a given period when the daily precipitation amount is higher than the 95th percentile of the daily precipitation amounts for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990. | ||||||||||||||||
Precipitation fraction due to extremely wet days | R99pFRAC | % | Rain | The percentage of days in a given period when the daily precipitation amount is higher than the 99th percentile of the daily precipitation amounts for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990. | ||||||||||||||||
Precipitation total due to moderate wet days | R75pTOT | mm | Rain | The accumulated daily precipitation amount in a given period for the days when the daily precipitation amount is higher than the 75th percentile of the daily precipitation amounts for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990. | ||||||||||||||||
Precipitation total due to very wet days | R95pTOT | mm | Rain | The accumulated daily precipitation amount in a given period for the days when the daily precipitation amount is higher than the 95th percentile of the daily precipitation amounts for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990. | ||||||||||||||||
Precipitation total due to extremely wet days | R99pTOT | mm | Rain | The accumulated daily precipitation amount in a given period for the days when the daily precipitation amount is higher than the 99th percentile of the daily precipitation amounts for the 5-day windows centred on each calendar day in the corresponding climatological period for 1961-1990. | ||||||||||||||||
Total precipitation on wet days | PRCPTOT | mm | Rain | The accumulated daily precipitation amount on wet days (when the daily precipitation amount is equal to or larger than 1 mm) in a given period. | ||||||||||||||||
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*For the calculation of spells (CSDI, WSDI, CDD, CWD) the spells are cut-off at the end of the calendar year. This might interfere with the applications where the continuation of a spell into the next calendar year is relevant. For these applications, additional datasets are provided with the names: altCSDI, altWSDI, altCDD, altCWD. |
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