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IMPROVE data flagging protocal

The following is a summary of IMPROVE data flagging procedures conducted by NPS/CIRA. Detailed information are available in the provided links.

AEROSOL

IMPROVE aerosol data are obtained from UCD and ingested into VIEWS http://vista.cira.colostate.edu/views/web/documents/documents.aspx
Module level native flags are assigned to individual parameter values as sample level flags.
If a valid module level flag is assigned to a missing (NULL) sample value the missing data flag MV is assigned.
Native parameter level flags are mapped to NARSTO Status Flags. Table 1 below lists the IMPROVE native flags and their corresponding VIEWS Status flags.

NEPHELOMETER

IMPROVE data are obtained from ARS and ingested into VIEWS.
Sample level validity flags are recorded as native sample level flags


Aerosol Flags	Nephelometer Flags
Table 1.

Native Flag	Description	VIEWS Status Flag	Status Flag Description
AA	ORGANIC ARTIFACT CORRECTED	V5	Valid value but qualified because of possible contamination
AP	POSSIBLE ORGANIC ARTIFACT	V5	Valid value but qualified because of possible contamination
BI	Incorrect installation of sample cartridge during weekly change	M2	Missing value because invalidated by data originator
CG	Clogging Filter, Flow rate less than 18 L/min for more than 1 hour. This affects the cut point of the particle but the concentrations are correct.	V2	Valid estimated value
CL	Clogged Filter, Flow rate less than 15 L/min for more than 1 hour.	M3	Missing value due to clogged filter
DE	Derived or calculated value	V0	Valid value
EP	Equipment Problem	M1	Missing value because no value is available
LF	Low/high flow rate. The average flow rate results in a cyclone cut point outside of the 2-3 micro-m range. This corresponds to flow rates < 21.3 L/min or > 24.3 L/min.	V5	Valid value but qualified because of possible contamination
MV	Missing module level value.	M1	Missing value because no value is available
NA	Not Applicable. This is used for missing modules with non-protocol samplers with less than four modules.	M1	Missing value because no value is available
NM	NORMAL	V0	Valid value
NR	Not Reprocessed, Carbon data between 2000 – 2004 which were not Reprocessed to account for negative OP that had originally been reported as zero.	V0	Valid value
NS	Operator did not install the samples or installed them too late to acquire a valid time. All filters involved.	M1	Missing value because no value is available
OL	Off Line. In some cases, this is used when the sampler is inoperable due to hurricane or fire. For year 2000, this is used for the period after the Version 1 sampler is removed and before the Version 2 samples begins operation.	M1	Missing value because no value is available
PO	Power Outage. All filters involved.	M1	Missing value because no value is available
QA	QA problem suspected, value held back for further investigation	I1	Invalid value - known reason
QD	QUESTIONABLE DATA	V4	Valid value despite failing to meet some QC or statistical criteria
RF	High flow rate. The flow rate is greater than 27 L/min for more than 1 hour. This affects the cut point of the particle but the concentrations are correct.	V5	Valid value but qualified because of possible contamination
SA	Used to indicate some sort of 'Sampling Anomaly', though the exact definition has yet to be satisfactorily defined.	V6	Valid value but qualified due to non-standard sampling conditions
SP	An artifact filter was swapped with a sample filter.	V0	Valid value
SW	Suspected filter swap.	V0	Valid value
UN	The concentrations failed the data validation for unknown reasons.	M2	Missing value because invalidated by data originator
XX	The filter is damaged.	M2	Missing value because invalidated by data originator