Precipitation and Temperature Anomalies from MERRA-2 dataset

Anomalies in Precipitation and Temperature for tiles around the globe.

Data derived from the reanalysis MERRA-2 project [1]. The dataset covers the period from 1980 to 2018, between 80ºN and 80ºS. The spatial resolution is 1.0º x 1.0º resulting in 45,792 tiles and a time resolution of 7 days (by averaging the values over each week). Precipitation time-series were re-scaled by applying a logarithmic function to all values.

To discount seasonality effects, we averaged temperature and precipitation values for each of the 365 calendar days. We considered the interval from 1 January 1980 through 28 February 2018 as the climatic period for which the long-term averages were computed. The anomalies are then obtained by subtracting for each day the respective average temperature or precipitation from the climatic period (for example, the 1 January 1998 anomaly is computed as the value for that day minus the average of all January 1 values between 1980 and 2018).

To process the data, use the code available in:

https://github.com/filipinascimento/teleconnectionsgranger/

http://arxiv.org/abs/2012.03848

[1] A. Molod, L. Takacs, M. Suarez, and J. Bacmeister, “Development of the geos-5 atmospheric general circulation model: evolution from merra to merra2,” Geoscientific Model Development 8, 1339–1356 (2015).