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A new direct absorption tunable diode laser spectrometer for high precision measurement of water vapor in the upper troposphere and lower stratosphere
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10.1063/1.4815828
/content/aip/journal/rsi/84/7/10.1063/1.4815828
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/7/10.1063/1.4815828

Figures

Image of FIG. 1.
FIG. 1.

(a) A schematic of the newly reconfigured HWV instrument that includes both the Lyman-α and HHH detection axes. The subsystems that measure temperature and pressure and control the sampling and velocity through the instrument duct are labeled. (b) The HWV instrument loaded in the spearpod of the WB-57 during the MACPEX mission. (c) The primary inlet and HHH detection axis.

Image of FIG. 2.
FIG. 2.

Diagram of HHH optical components. (a) Laser pressure vessel (LPV). (b) Signal pressure vessel (SPV).

Image of FIG. 3.
FIG. 3.

Diagram of the electronics used to process the detector signals including the anti-alias filter (AAF) and Scalable Signal Processing (SSP) board. LVDS: Low Voltage Differential Signaling; SPI: Small Peripheral Interface; DSP: Digital Signal Processing; PHY: Ethernet Physical Layer Transceiver; FPGA: Field Programmable Gate Array.

Image of FIG. 4.
FIG. 4.

(a) A typical set of HHH spectra acquired in flight on 4/20/11 at 160 hPa, −45 °C, and 4.3 ppmv HO. The spectra have been normalized to the voltage of the Herriott cell spectrum. (b) The same data as in (a), now de-trended from the baseline power curve and fit using a voigt lineshape. The top panel shows the residual between the raw and fit data.

Image of FIG. 5.
FIG. 5.

Schematic of HWV calibration bench. Controlled quantities of saturated air are combined with a flow of dry air which is directed to both the HHH and Lyman-α detection axes.

Image of FIG. 6.
FIG. 6.

(a) Laboratory intercomparison between Lyman-α, HHH, and the bubbler, where the bubbler data includes the water added by the bubbler plus the residual water vapor in the “dry” air flow as measured by Lyman-α. (b) HO as measured by HHH compared to that measured by Lyman-α for the laboratory calibration shown to the left.

Image of FIG. 7.
FIG. 7.

Sample time series of Lyman-α and HHH water vapor measurements from the flight on April 25, 2011 during the first high altitude leg.

Image of FIG. 8.
FIG. 8.

(a) HO as measured by HHH compared to that measured by Lyman-α for each day that HHH acquired data. Also shown is a 1:1 fit with a +0.35 ppmv offset and ±10% bounds. (b) The fractional difference between HHH and Lyman-α for each flight day is shown vs. Lyman-α water vapor.

Tables

Generic image for table
Table I.

TDL water vapor instruments which have been flown in the UT/LS.

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/content/aip/journal/rsi/84/7/10.1063/1.4815828
2013-07-22
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A new direct absorption tunable diode laser spectrometer for high precision measurement of water vapor in the upper troposphere and lower stratosphere
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/7/10.1063/1.4815828
10.1063/1.4815828
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