Aura MLS
HCN
Contact: Hugh Pumphrey
HCN is a minor constituent of the atmosphere, whose sources are thought to be at the Earth's surface.
How it is part of MLS Science Objectives
HCN is a "secondary" MLS data product, that can provide new information on the extent to which this tropospheric source molecule reaches the stratosphere and may (or may not) be involved with stratospheric chemistry.
How EOS MLS measures HCN
HCN is retrieved from bands encompassing, in the lower sideband, the 177.26GHz spectral line of HCN. Although the target line is in an uncluttered part of the spectrum, the upper sideband containsmany interfering lines of O3 and HNO3. As a result, the v5.0x HCN product is not recommended for general use at altitudes below 21 hPa. In the recommended range it is usable, but has rather poor precision (necessitating averaging such as weekly zonal means) and resolution.
HCN Information from the Spectroscopy Database
Quick Product Information for data version v5
- Swath Name: HCN
- Status Flag: Only use profiles for which the Status field is an even number.
- Useful Range: 21 - 0.1 hPa
- DAAC Short Name: ML2HCN
- Precision: Only use values for which the estimated precision is a positive number.
- Quality Threshold: >0.2
- Convergence Threshold: <2.0
Latest Publications (HCN)
Kloss, C., P. Sellitto, M. von Hobe, G. Berthet, D. Smale, G. Krysztofiak, C. Xue, C. Qiu, F. Jégou, I. Ouerghemmi and B. Legras
Australian Fires 2019–2020: Tropospheric and Stratospheric Pollution Throughout the Whole Fire Season
Livesey, N., W. Read, L. Froidevaux, A. Lambert, M. Santee, M. Schwartz, L. Millán, R. Jarnot, P. Wagner, D. Hurst, K. Walker, P. Sheese and G. Nedoluha
Investigation and amelioration of long-term instrumental drifts in water vapor and nitrous oxide measurements from the Aura Microwave Limb Sounder MLS and their implications for studies of variability and trends
Pumphrey, H., M. Schwartz, M. Santee, G. Kablick III, M. Fromm and N. Livesey
Microwave Limb Sounder MLS observations of biomass burning products in the stratosphere from Canadian forest fires in August 2017
Schwartz, M., M. Santee, H. Pumphrey, G. Manney, A. Lambert, N. Livesey, L. Millán, J. Neu, W. Read and F. Werner
Australian New Year's PyroCb Impact on Stratospheric Composition
Pumphrey, H., N. Glatthor, P. Bernath, C. Boone, J. Hannigan, I. Ortega, N. Livesey and W. Read
MLS measurements of stratospheric hydrogen cyanide during the 2015–2016 El Niño event
Santee, M.L., G.L. Manney, N.J. Livesey, M.J. Schwartz, J.L. Neu and W.G. Read
A comprehensive overview of the climatological composition of the Asian summer monsoon anticyclone based on 10 years of Aura Microwave Limb Sounder measurements
Allen, D.R., K.W. Hoppel and D.D. Kuhl
Wind extraction potential from 4D-Var assimilation of stratospheric O3, N2O, and H2O using a global shallow water model
Schoeberl, M.R., A.E. Dessler, T. Wang, M.A. Avery and E.J. Jensen
Cloud formation, convection, and stratospheric dehydration
Pumphrey, H.C., M.L. Santee, N.J. Livesey, M.J. Schwartz and W.G. Read
Microwave Limb Sounder observations of biomass-burning products from the Australian bush fires of February 2009
Pommrich, R., R. Mueller, J.U. Grooss, G. Gunther, P. Konopka, M. Riese, A. Heil, M. Schultz, H.C. Pumphrey and K.A. Walker
What causes the irregular cycle of the atmospheric tape recorder signal in HCN?
Li, Q., P.I. Palmer, H.C. Pumphrey, P. Bernath and E. Mahieu
What drives the observed variability of HCN in the troposphere and lower stratosphere?
Pumphrey, H.C., C. Boone, K.A. Walker, P. Bernath and N.J. Livesey
The tropical tape recorder observed in HCN
Cofield, R.E. and P.C. Stek
Design and field-of-view calibration of 114-660 GHz optics of the Earth Observing System Microwave Limb Sounder
Pumphrey, H.C., C.J. Jimenez and J.W. Waters
Measurement of HCN in the middle atmosphere by EOS MLS