Open AccessGround‐based measurements of ClO from Mauna Kea and intercomparisons with Aura and UARS MLS
Author(s) -
Nedoluha Gerald E.,
Connor Brian J.,
Barrett James,
Mooney Thomas,
Parrish Alan,
Boyd Ian,
Wrotny Jonathan E.,
Gomez R. Michael,
Koda Jin,
Santee Michelle L.,
Froidevaux Lucien
Publication year - 2011
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2010jd014732
Subject(s) - microwave limb sounder , environmental science , satellite , aura , atmospheric sciences , mixing ratio , stratosphere , geology , physics , medicine , alternative medicine , pathology , astronomy
The ground‐based measurements of upper stratospheric ClO, made with a ground‐based millimeter wave instrument at Mauna Kea, Hawaii (19.8°N, 204.5°E) starting in 1992, are compared with UARS (Upper Atmosphere Research Satellite) MLS ClO measurements (1991–1998) and the Aura MLS ClO measurements (2004–2009). The ground‐based measurements are made as part of the Network for the Detection of Atmospheric Composition Change (NDACC). Intercomparisons between the ground‐based measurements and the Aura MLS measurements show that both instruments retrieve similar seasonal variations over Mauna Kea. The seasonal variation in ClO is also compared with measurements of variations in stratospheric CH 4 , which affects the partitioning of total inorganic chlorine. Using the ground‐based instruments as a transfer standard, we find that the agreement between UARS and Aura MLS ClO measurements near the peak of the mixing ratio profile is within ∼1%. Combining the uncertainties in the biases calculated from the coincident ground‐based and satellite measurements, we find that using the ground‐based data as a transfer standard allows us to provide a 2 σ limit to the bias between the UARS and Aura measurements of 3%–4% near the peak of the ClO profile. Given agreement between UARS and Aura MLS of ∼1% ± 4%, there is no reason to apply any bias correction in order to use the UARS and Aura MLS ClO measurements as a single data set.