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CARMA’s Climate database

S. Thorisson. L. Witter. CARMA’s Climate database. J. Fox. Why a CARMA climate database. CARMA’s goal to monitor and assess impacts of global change on caribou Major approach is cross-herd comparisons

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CARMA’s Climate database

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  1. S. Thorisson L. Witter CARMA’s Climate database J. Fox

  2. Why a CARMA climate database • CARMA’s goal to monitor and assess impacts of global change on caribou • Major approach is cross-herd comparisons • Need to compare (how are herd habitats similar) and contrast (how are herd habitats different) • Climate plays a central role in controlling caribou abundance and distribution • Ideal to have one source for the data – climate data

  3. 1979 – 2010 daily data available for over 100 variables across the circumpolar north

  4. …a few words about MERRA data • Universal coverage for over the last 30 years • Brings together all climate data within the satellite era • Ensures that different satellite provide a consistent measure of the environment • Data at least daily and, for example temperature, every 3 hours • 72 variables offered • Grid size ½ degree latitude by 2/3 degree longitude • Data is available to download within months • Estimate for CARMA to provide annual updates is ~ 18 hours – of which 15 hours is for MERRA data download

  5. STEP 1. DEFINE SEASONAL RANGES

  6. 8 polygons per herd for example – Bluenose West Herd summer calving tundra fall taiga winter spring whole herd

  7. 2 types of tables created Seasonal range tables Caribou movement tables calving calving summer summer winter winter fall fall 104 grids PCH winter 219 grids Taimyr winter

  8. Caribou-relevant climate derivatives winter spring/calving autumn summer autumn

  9. …a few examples:comparing years for a herd (summer temperature)

  10. …a few examples:comparing herds (summer temperature)

  11. …a few examples:snow depth comparing herds

  12. …a few examples:snow depth comparing years

  13. …a few examples:snow depth comparing years

  14. …a few examples:some caribou-specific variables

  15. How much data? • MERRA raw data 21.5 Gbytes • Polygon focused tables 2.1 Gbytes • Caribou focused tables 138 Mbytes • TOTAL ~ 25 GBytes

  16. Some questions for the breakout • Data quality? – Greenness Index, Leaf Area Index • validation • Documentation needs? • Access? • Additional caribou related variables? • Are there basic summaries needed? • Trend analysis? • Tele-connections? • Update schedule – annual, timing?

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