ASDC | ASHOE-MAESA_TraceGas_AircraftInSitu_ER2_Data

ASHOE Level 2

Entry Title: ASHOE/MAESA ER-2 Aircraft In-Situ Trace Gas Data

Entry ID: ASHOE-MAESA_TraceGas_AircraftInSitu_ER2_Data_1

Field Campaigns

Description

ASHOE-MAESA_TraceGas_AircraftInSitu_ER2_Data is the in-situ trace gas data for the ER-2 aircraft collected during the Airborne Southern Hemisphere Ozone Experiment/Measurements for Assessing the Effects of Stratospheric Aircraft (ASHOE/MAESA) suborbital campaign. Data were collected by instruments such as the Harvard Hydroxyl Experiment (HOx), Airborne Chromatograph for Atmospheric Trace Species (ACATS), NOAA O3 Classic, Aircraft Laser Infrared Absorption Spectrometer (ALIAS), the Multiple Axis Resonance Fluorescence Chemical Conversion Detector for ClO and BrO (ClO/BrO), and the High-Altitude Fast Response CO2 Analyzer (Harvard CO2). Data collection for this product is complete.

The ASHOE/MAESA campaign was a multi-organizational effort of NASA, NOAA, and the US Natinal Science Foundation (NSF). The meteorological services of New Zealand, Australia, United Kingdom, and those signatory to the convection governing the European Centre for Medium – range Weather Forecasts (ECMWF) also aided in this mission. ASHOE/MAESA was conducted in four main deployments covering the period from January to November 1994. Its overarching goal was to investigate the causes of long-term reductions of ozone in the wintertime midlatitudes in the southern hemisphere, which had been observed for the last 15 years by ground-based instruments and satellites. ASHOE/MAESA had a secondary objective to obtain measurements for the assessment of the atmospheric effects of supersonic (High Speed Civil Transport) aircrafts.

In order to accomplish these objectives, the ASHOE/MAESA team used the NASA ER-2 aircraft alongside balloons, ground sites, and satellite imagery. A total of 45 flights were conducted, including 26 from Christchurch, New Zealand, 5 from Barber’s Point, Hawaii, and 6 transit flights between Christchurch, Fiji, Hawaii, and California. Some additional flights were flown from California, including surveys up to Alaska and Canada. Most of the flights were flown from Christchurch into the Southern high latitudes to probe the outer regions of the Southern polar vortex. Overall, the latitudinal extent of the ASHOE/MAESA flights was from 70S to 60N. The full payload was included on 32 of the flights, 11 carried the dynamics and radiation configuration, and 2 were test flights for individual instruments. The ER-2 was equipped with 20 instruments, including the Meteorological Measurement System (MMS), the NOAA NOy Instrument (NOAA NOy), Airborne Chromatograph For Atmospheric Trace Species (ACATS), the Airborne Tunable Laser Absorption Spectrometer (ATLAS), and the Wing Tip Air Particulate Sampler (APS). Some of the data collected by these instruments are as follows: temperature, NO, NO2, NOy, CH4, SF6, CHCl3, H2, O3, CO, SO4, and Black Carbon at various wavelengths. Ground sites collected various data on atmospheric temperature, pressure, and ozone mixing ratio. Balloon sondes collected data on atmospheric variables (temperature, pressure, wind direction, etc.). An early version of the Goddard Space Flight Center’s assimilation system was used to monitor meteorological patterns during ASHOE/MAESA to assist in planning the best flight paths. These data, along with satellite data, were used to give global context for local measurements of the ER-2.

DOI

10.5067/ASDC/SUBORBITAL/ASHOE-MAESA/TraceGas_AircraftInSitu_ER2_Data_1

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GENERAL DOCUMENTATION

ASHOE/MAESA Mission Statement
ASHOE/MAESA Science Overview

From GCMD Science Keywords:

HYDROGEN CHLORIDE > HALOCARBONS AND HALOGENS
HYDROXYL > HYDROGEN COMPOUNDS
BROMINE MONOXIDE > HALOCARBONS AND HALOGENS
METHANE > CARBON AND HYDROCARBON COMPOUNDS
NITROUS OXIDE > NITROGEN COMPOUNDS
CARBON MONOXIDE PROFILES > ATMOSPHERIC CARBON MONOXIDE > CARBON AND HYDROCARBON COMPOUNDS
CFC-11 > CHLOROFLUOROCARBONS > HALOCARBONS AND HALOGENS
CARBON DIOXIDE PROFILES > ATMOSPHERIC CARBON DIOXIDE > CARBON AND HYDROCARBON COMPOUNDS
HYDROFLUOROCARBONS > HALOCARBONS AND HALOGENS
CARBON TETRACHLORIDE > HALOCARBONS AND HALOGENS
SULFUR HEXAFLUORIDE PROFILES > SULFUR HEXAFLUORIDE > SULFUR COMPOUNDS
HYDROPEROXY > HYDROGEN COMPOUNDS
CFC-12 > CHLOROFLUOROCARBONS > HALOCARBONS AND HALOGENS
OZONE PROFILES > ATMOSPHERIC OZONE > OXYGEN COMPOUNDS
CHLORINE MONOXIDE > HALOCARBONS AND HALOGENS

Data Distribution

File Format(s):

AMES

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Spatial Information

Spatial Coverage: (S: -80.05, N: 73.14), (W: -180, E: 180)
Spatial Coverage Type: Horizontal Vertical
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian

Locations

HAWAII ALASKA NORTHERN HEMISPHERE SOUTHERN HEMISPHERE WESTERN HEMISPHERE TROPOSPHERE FIJI

Temporal Information

Temporal Coverage: 1994-01-21 - 1994-11-06

Platforms

Jet

NASA ER-2

NASA Earth Resources-2

Harvard CO2

High-Altitude Fast-Response CO2 Analyzer

ACATS

Airborne Chromatograph for Atmospheric Trace Species

NOAA O3 Classic

Dual-Beam UV-Absorption Ozone Photometer

ATLAS

Airborne Tunable Laser Absorption Spectrometer

ClO/BrO

Multiple Axis Resonance Fluorescence Chemical Conversion Detector for ClO and BrO

ALIAS

Airborne Laser Infrared Absorption Spectrometer

HOx

Harvard Hydroxyl Experiment

Metadata Dates

Created on 2026-01-21