If no r.mapcalc expression is defined, the selected maps are simply registered in the new created output space time raster dataset to avoid data duplication.
t.rast.extract input=tempmean_monthly where="start_time > '2010-01-05'" \ output=selected_tempmean_monthly basename=new_tmean_month \ expression="if(tempmean_monthly < 0, null(), tempmean_monthly)"
t.rast.extract input=tempmean_monthly output=tempmean_monthly_later_2012 \ where="start_time >= '2012-01-01'" t.rast.list tempmean_monthly_later_2012 name|mapset|start_time|end_time 2012_01_tempmean|climate_2000_2012|2012-01-01 00:00:00|2012-02-01 00:00:00 2012_02_tempmean|climate_2000_2012|2012-02-01 00:00:00|2012-03-01 00:00:00 2012_03_tempmean|climate_2000_2012|2012-03-01 00:00:00|2012-04-01 00:00:00 2012_04_tempmean|climate_2000_2012|2012-04-01 00:00:00|2012-05-01 00:00:00 2012_05_tempmean|climate_2000_2012|2012-05-01 00:00:00|2012-06-01 00:00:00 2012_06_tempmean|climate_2000_2012|2012-06-01 00:00:00|2012-07-01 00:00:00 2012_07_tempmean|climate_2000_2012|2012-07-01 00:00:00|2012-08-01 00:00:00 2012_08_tempmean|climate_2000_2012|2012-08-01 00:00:00|2012-09-01 00:00:00 2012_09_tempmean|climate_2000_2012|2012-09-01 00:00:00|2012-10-01 00:00:00 2012_10_tempmean|climate_2000_2012|2012-10-01 00:00:00|2012-11-01 00:00:00 2012_11_tempmean|climate_2000_2012|2012-11-01 00:00:00|2012-12-01 00:00:00 2012_12_tempmean|climate_2000_2012|2012-12-01 00:00:00|2013-01-01 00:00:00
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