Dear all,
I am trying to find CF compliant representations of various degree-day indices and find the standard name integral_of_air_temperature_excess_wrt_time with the following description:
"integral_of_Y_wrt_X" means int Y dX. The data variable should have an axis for X specifying the limits of the integral as bounds. "wrt" means with respect to. Air temperature is the bulk temperature of the air, not the surface (skin) temperature. The air temperature excess is the air temperature minus the air temperature threshold. Its integral with respect to time is often called after its units of "degree-days".
This seems suitable but just to clarify, does "air temperature excess" include 'negative excess'? E.g. is it integral(T-t) or is it integral(max(T-t),0)), where T is air temperature, and t is threshold temperature? This is not entirely clear from the explanation " air temperature excess is the air temperature minus the air temperature threshold".
Many thanks,
Lars
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Lars B?rring
FDr,Forskare / G?stprofessor,CEC/Lunds universitet
PhD,Senior Scientist / Guest professor,CEC/Lund University
SMHI / Swedish Meteorological and Hydrological Institute
Rossby Centre
SE - 601 76 NORRK?PING
http://www.smhi.se
E-post / Email: lars.barring at smhi.se
Tel / Phone: +46 (0)11 495 8604
Fax: +46 (0)11 495 8001
Bes?ksadress / Visiting address: Folkborgsv?gen 17
Received on Mon May 23 2016 - 03:19:47 BST
