MLS_L2_HCN
Variables
The table below lists the variables that are present in the HARP product that results from an ingestion of MLS_L2_HCN data.
field name |
type |
dimensions |
unit |
description |
|---|---|---|---|---|
datetime |
double |
{time} |
[seconds since 2000-01-01] |
time of the measurement |
longitude |
double |
{time} |
[degree_east] |
tangent longitude |
latitude |
double |
{time} |
[degree_north] |
tangent latitude |
pressure |
double |
{vertical} |
[hPa] |
pressure per profile level |
HCN_volume_mixing_ratio |
double |
{time, vertical} |
[ppv] |
HCN volume mixing ratio |
HCN_volume_mixing_ratio_uncertainty |
double |
{time, vertical} |
[ppv] |
uncertainty of the HCN volume mixing ratio |
HCN_volume_mixing_ratio_validity |
int32 |
{time, vertical} |
quality flag for the HCN volume mixing ratio |
|
index |
int32 |
{time} |
zero-based index of the sample within the source product |
Mapping description
Bits 4 to 9 and 11 to 14 in the quality flag denote a specific error condition while bits 0 to 2 denote the severity (bit 0 error, bit 1 warning, bit 2 comment).
Bits 4 to 9 denote the MLS status (bit 4 HICLOUD, bit 5 LOWCLOUD, bit 6 NO_APRIORI_T, bit 7 NUM_ERROR, bit 8 TOO_FEW_RAD, bit 9 GLOB_FAILURE).
Bits 11 to 14 denote specific checks as specified in the EOS MLS data quality document (the pressure range, quality and convergence thresholds come from table 1.1.1 in issue 4.x-4.0 of that document): Bit 11 denotes pressure out of range, bit 12 denotes quality below threshold, bit 13 denotes convergence above threshold and bit 14 denotes a negative precision. Also, if any of the bits 11 to 14 is set, bit 0 is automatically set.
The table below details where and how each variable was retrieved from the input product.
field name |
mapping description |
|
|---|---|---|
datetime |
path |
/HDFEOS/SWATHS/HCN/Geolocation_Fields/Time[] |
description |
the time converted from TAI93 to seconds since 2000-01-01T00:00:00 |
|
longitude |
path |
/HDFEOS/SWATHS/HCN/Geolocation_Fields/Longitude[] |
latitude |
path |
/HDFEOS/SWATHS/HCN/Geolocation_Fields/Latitude[] |
pressure |
path |
/HDFEOS/SWATHS/HCN/Geolocation_Fields/Pressure[] |
HCN_volume_mixing_ratio |
path |
/HDFEOS/SWATHS/HCN/Data_Fields/L2gpValue[] |
HCN_volume_mixing_ratio_uncertainty |
path |
/HDFEOS/SWATHS/HCN/Data_Fields/L2gpPrecision[] |
HCN_volume_mixing_ratio_validity |
path |
/HDFEOS/SWATHS/HCN/Data_Fields/Status[], /HDFEOS/SWATHS/HCN/Data_Fields/Quality[], /HDFEOS/SWATHS/HCN/Data_Fields/Convergence[], /HDFEOS/SWATHS/HCN/Data_Fields/L2gpPrecision[], /HDFEOS/SWATHS/HCN/Geolocation_Fields/Pressure[] |
description |
see generic mapping description |
|