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Overview of ARM Instrumentation at the Darwin Site: Measuring Atmospheric Properties

This document provides a comprehensive overview of the ARM (Atmospheric Radiation Measurement) instrumentation strategy employed at the Darwin site, focusing on the measurement of radiatively important properties of the atmospheric column and surface radiation budget. It details the various instruments used, including 35 GHz radar, lidar, sky imagers, and radiometers that assess temperature, humidity, cloud properties, and aerosol optical depth. Additionally, it discusses data availability and accessibility through the ARM archive, enabling researchers to utilize high-resolution atmospheric data collected continuously since the project’s inception.

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Overview of ARM Instrumentation at the Darwin Site: Measuring Atmospheric Properties

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  1. ARM Data Overview Chuck Long Jim Mather Tom Ackerman

  2. ARM Instrumentation Strategy • Measure all the radiatively important properties of the atmospheric column and the surface radiation budget • State parameters (temp, humidity) • Cloud occurrence and properties • Aerosol optical depth 2

  3. Instrumentation at Darwin ARM site • 35 GHz Radar (cloud properties) • Lidar (pulsed laser; particle and thin cloud properties ) • Sky imagers (cloud cover) • Broad-band and narrow-band radiometers (solar and infrared radiation) • Microwave radiometer (water vapor and liquid water) • Meteorology sensors (temp, humidity, winds) 3

  4. TWP Darwin Site 4

  5. A case studyJanuary 23, 2006 5

  6. mm Cloud Radar – cirrus mode 6

  7. mm Cloud Radar – cirrus mode 7

  8. mm Cloud Radar – boundary layer mode 8

  9. Micropulse lidar (also have ceilometer data) 9

  10. Microwave radiometer (2 channel, vertical looking) 10

  11. Microwave radiometer (2 channel, vertical looking) 11

  12. 12

  13. 13

  14. Other instruments • AERI – Thermal infrared interferometer – provides high resolution spectra in two bands (3-5 m and 8-20 m) • Multi-filter rotating shadowband radiometer (MFRSR) – measures narrow band irradiance – retrieve aerosol optical depth and Angstrom coefficient 14

  15. Data availability • All systems collecting data continuously since beginning of the experiment • All data available essentially on next day basis from ARM archive • Start at www.arm.gov, go to Data and then Data Archive tabs • Quicklook plots (NOTE: Darwin is “C3”) • University of Utah – link on TWP ICE page • ARM browser – start at www.arm.gov, go to Data tab; then “Data plots” tap on right and then “Plot Browser” under Data Quality heading: http://dq.arm.gov/plotbrowser/ 15

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