HDF5 file, superblock version 2
group /
	attribute author = "Clair Duchamp: clair.duchamp@lmd.ipsl.fr", "Bernard Legras: bernard.legras@lmd.ipsl.fr"
	attribute creation = "2025-03-28 20:40"
	attribute date = "2023-08-13"
	attribute generator = "combinatExt_netCDF4_NASA.ipynb"
	attribute history = "Generated from OMPS NASA v2.1 and ERA5 data"
	attribute institution = "Laboratoire de Météorologie Dynamique (LMD-IPSL)"
	attribute title = "Tropopause height retrieval along OMPS NASA v2.1 orbit track for 2023-08-13 (v1.0)"
	attribute version = "1.0"
dataset /O3_curtain: float32, shape (2120, 41)
	attribute _FillValue = 2.14748365e+09
	attribute description = "O3 curtain along the satellite central track from ERA5 interpolated to OMPS NASA altitudes."
	attribute long_name = "Ozone mixing ratio curtain"
	attribute units = "kg.kg-1"
dataset /PT_curtain: float32, shape (2120, 41)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Potential Temperature curtain along the satellite central track from ERA5 interpolated to OMPS NASA altitudes."
	attribute long_name = "Potential Temperature curtain"
	attribute units = "K"
dataset /PV_curtain: float32, shape (2120, 41)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Potential Vorticity curtain along the satellite central track from ERA5 interpolated to OMPS NASA altitudes."
	attribute long_name = "Potential Vorticity curtain"
	attribute units = "PVU"
dataset /SAA: int32, shape (2120)
	attribute _FillValue = 2147483647
	attribute description = "0 = estimated SAA effects at satellite location are < 5% of nominal maximum value, based on OMPS-LP climatology. 1 = estimated SAA effects are 5-40% of nominal maximum value. 2 = estimated SAA effects are 40-75% of nominal maximum value. 3 = estimated SAA effects are > 75% of nominal maximum value. For SAOD calculations, the user is recommended to filter non-zero values with SAA >= 1."
	attribute long_name = "South Atlantic Anomaly (SAA)"
	attribute units = " "
dataset /SAOD: float32, shape (2120)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Integration of extinction_filt over altitude from tropopause_height_zT_smoothed + km_above_tropopause to 30 km."
	attribute long_name = "Stratospheric Aerosol Optical Depth (SAOD)"
	attribute units = " "
dataset /T_curtain: float32, shape (2120, 41)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Temperature curtain along the satellite central track from ERA5 interpolated to OMPS NASA altitudes."
	attribute long_name = "Temperature curtain"
	attribute units = "K"
dataset /altitude: float32, shape (41)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Altitude from the ground."
	attribute long_name = "Altitude"
	attribute units = "km"
// altitude: first 0.5, last 40.5, count 41
dataset /cloud_height: float32, shape (2120)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Observed cloud height for each event."
	attribute long_name = "Cloud height"
	attribute units = "km"
dataset /cloud_type: int32, shape (2120)
	attribute _FillValue = 2147483647
	attribute description = "Cloud type flag: 0 = no cloud. 1 = cloud. 2 = enhanced aerosol. 3 = PSC. For SAOD calculations, the user is recommended to filter clouds (1) until cloud top height (cloud_height) and PSCs (3) for the whole profile."
	attribute long_name = "Cloud type"
	attribute units = " "
dataset /event: int32, shape (2120)
	attribute _FillValue = 2147483647
	attribute description = "Sequential number of measurement within an orbit."
	attribute long_name = "Event number"
	attribute units = " "
dataset /extinction_filt: float32, shape (2120, 41)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Filtered retrieved extinction coefficient at 869 nm, center slit. Filters used are: SAA, cloud_type, cloud_height, retrieval_flag."
	attribute long_name = "Filtered retrieved extinction coefficient at 869 nm (recommended for SAOD calculations)"
	attribute units = "km-1"
dataset /extinction_no_filt: float32, shape (2120, 41)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Raw retrieved aerosol extinction coefficient at 869 nm, center slit."
	attribute long_name = "Raw retrieved extinction coefficient at 869 nm"
	attribute units = "km-1"
dataset /km_above_tropopause: int32, shape (2120)
	attribute _FillValue = 2147483647
	attribute description = "Offset containing the value of the height to add to the tropopause altitude because of the presence of residual clouds at the bottom of the stratosphere determined from a sensitivity analysis of the SAOD. Maximum value is 2 km except beyond 70° - where the offset can reach 7 km without exceeding 15 km in altitude, added to the tropopause height. The value is masked when the entire corresponding extinction profile from extinction_filt is filtered."
	attribute long_name = "Kilometers above tropopause (for SAOD calculations)"
	attribute units = "km"
dataset /latitude: float32, shape (2120)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Latitude."
	attribute long_name = "Latitude"
	attribute units = "°N"
dataset /longitude: float32, shape (2120)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Longitude."
	attribute long_name = "Longitude"
	attribute units = "°E"
dataset /orbit: int32, shape (2120)
	attribute _FillValue = 2147483647
	attribute description = "ID number of the orbit to which this measurement belongs."
	attribute long_name = "Orbit number"
	attribute units = " "
dataset /retrieval_flag: int32, shape (2120)
	attribute _FillValue = 2147483647
	attribute description = "Retrieval processing status flag; non-zero value = failure. For SAOD calculations, the user is recommended to filter data with retrieval_flag != 0."
	attribute long_name = "Retrieval flag"
	attribute units = " "
dataset /time: float32, shape (2120)
	attribute _FillValue = 2.14748365e+09
	attribute calendar = "none"
	attribute description = "Seconds from the beginning of the day (UT)."
	attribute long_name = "Time"
	attribute units = "second"
// time: first 2680.0, last 84801.0, count 2120
dataset /tropopause_height_wmo: float32, shape (2120)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Tropopause height according to the WMO highest definition. "
	attribute long_name = "Tropopause height with WMO method from ERA5"
	attribute units = "km"
dataset /tropopause_height_zT: float32, shape (2120)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Combination of the 380 K surface and the ± 3.5 PVU surface in the extratropics. The boundaries of the tropical region on each orbit are defined as the first location where the 380 K and the -3.5 PVU surfaces are closer than 500 m at latitude > 35°S from the south and the last location where the 380 K and the 3.5 PVU surface are closer than 500 m at latitude < 35°N in the north."
	attribute long_name = "Tropopause height with zT method from ERA5"
	attribute units = "km"
dataset /tropopause_height_zT_smoothed: float32, shape (2120)
	attribute _FillValue = 2.14748365e+09
	attribute description = "Smoothed version of tropopause_height_zT. Tropopause folds are smoothed by using an osculating parabola from the above using Legendre transform as in Legras et al. (2005)."
	attribute long_name = "Smoothed tropopause height with zT method from ERA5"
	attribute units = "km"