KLIMA	OBSERVASJON	FOU	IT

KVALOBS
Kvalitetssikring av observasjoner

QC1-7 DETECTION OF COLLECTED VALUES FOR SEPARATION

Gabriel Kielland

In the extended use and presentation of some observations there is a need to infere a simulated observation taken to cover a shorter time span than the one observed.

In Kvalobs the separation procedure will be implemented for precipitation, maximum temperature and minimum temperature.

The Kvalobs parameters are:

RR_X - Amount of precipitation which has fallen during a period preceding the standard time of observation;

TAX_X - Temperature in degrees C, maximum one minute value during a period preceding the standard time of observation;

TAN_X - Temperature in degrees C, minimum one minute value during a period preceding the standard time of observation.

The parameter values RR_X, TAX_X and TAN_X will be entered in the database together with values to indicate commencement and ending of the period. The time parameters are:

KLSTART - Time of phenomenon commencement, 12 digits YYYYMMDDHHmm (“measurement from”)

KLOBS - Time of phenomenon ending, 12 digits YYYYMMDDHHmm (“measurement untill”)

The following flag values are available:

fd=0	Not considered as collected value
fd=1	Normal observation, not collected value
fd=2	The original value is a collected value not separated
fd=3	Abnormal observation. The original value may be a collected value

The rules for applying the flag values is the following:

“measurement from” minus “measurement untill” < 23 hours => fd=3

“measurement from” minus “measurement untill” >= 23 hours og
“measurement from” minus “measurement untill” <= 25 hours => fd=1

“measurement from” minus “measurement untill” > 25 hours og
“measurement from” minus “measurement untill” < 47 hours => fd=3

“measurement from” minus “measurement untill” >= 47 hours og
“measurement from” minus “measurement untill” <= 73 hours => fd=2

“measurement from” minus “ measurement untill” > 73 hours => fd=3

Note that whenever KLOBS or KLSTART is a non valid time indication the observationen is flagged with fd=3.

Also with KLOBS or KLSTART missing the observation is flagged with fd=3.

Automatic separation of precipitation amount

The separation algorithms is to be implemented with QC2. The observation stored as an RR_X parameter will then be translated into one or several RR_24 values. The observed value will be placed in the field data.original and the separated partial value will be placed in the field data.corrected.

Last modified: Fri Dec 31 12:47:00 GMT 2004