Reply on RC1/RC2

Опубликована: Фев. 22, 2024

Abstract. The Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) is currently providing the only measurements of vertically resolved chlorodifluoromethane (HCFC-22) from space. This study assesses ACE-FTS HCFC-22 v5.2 product in upper troposphere – lower stratosphere, as well simulated concentrations a 39-year specified dynamics run Canadian Middle Atmosphere Model (CMAM39) same region. In general, observations tend to agree with subsampled CMAM39 data within ±5 %, except for between ~15 and 25 km extratropical regions where exhibits negative bias 5–30 near 6 tropics ACE FTS 15 %. When comparing against correlative satellite, aircraft, balloon data, typically low on order 0–10 % ~5–15 ±15 ~15–25 km. ACE-FTS, CMAM39, surface flask NOAA Global Monitoring Laboratory’s air-sampling network, all exhibit consistent tropospheric trends ranging 6.8 7.8 pptv/year (within 95 confidence) 2004–2012, 3.1 4.7 2012–2018. Interhemispheric differences (IHD) were also derived using NOAA, three yielded correlated (r≥0.42) IHD timeseries, results indicating that values decreased at rate 2.2±1.1 pptv/decade 2004 2018.

Язык: Английский

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Smoke with Induced Rotation and Lofting (SWIRL) Generated by the February 2009 Australian Black Saturday PyroCb Plume

Journal of Geophysical Research Atmospheres, Год журнала: 2024, Номер 129(5)

Опубликована: Фев. 28, 2024

Abstract The discovery of smoke‐induced dynamical anomalies in the stratosphere associated with 2019/2020 Australian New Year pyrocumulonimbus (pyroCb) super outbreak initiated a new field study involving aerosol/weather anomalies. This paper documents February 2009 Black Saturday pyroCb outbreak. Positive potential vorticity (indicating anticyclonic rotation) horizontal extent ∼1000 km and vertical thickness ∼2 are plume, which we classify as Smoke With Induced Rotation Lofting (SWIRL). SWIRL initially formed east Australia, but then moved westward, crossing over continuing to Africa. lasted for nearly three weeks (13 February–4 March), traveling ∼27,000 rising from temperatures ∼410–500 K (altitudes ∼18–21 km). altitude is corroborated coincident satellite‐based profiles H 2 O, CO, HCN, O 3 , aerosol extinction. A temperature dipole (±3 K) accompanied PV anomaly, verified Global Navigation Satellite System radio occultation temperatures. dissipated it passed Operational ECMWF forecasts early initialization February) late (21 examined. In case, forecasted anomaly disappeared within 4 days, expected due lack smoke heating forecast model. while was weaker than reanalyzes, remnant remained out 10 days.

Язык: Английский

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Investigating the vertical extent of the 2023 summer Canadian wildfire impacts with satellite observations

Опубликована: Фев. 28, 2024

Abstract. Pyrocumulonimbus clouds (pyroCbs) generated by intense wildfires can serve as a direct pathway for the injection of aerosols and gaseous pollutants into lower stratosphere, resulting in significant chemical, radiative, dynamical changes. Canada experienced an extremely severe wildfire season 2023, with total area burned that substantially exceeded those previous events known to have impacted stratosphere (such 2020 Australian fires). This also had record-high pyroCb activity, which raises question whether 2023 Canadian event resulted stratospheric perturbations. Here, we investigate this anomalous using retrievals from two satellite instruments, ACE-FTS (Atmospheric Chemistry Experiment – Fourier Transform Spectrometer) OMPS LP (Ozone Mapping Profile Suite Limb Profiler), determine vertical extents smoke along chemical signatures biomass burning. These data show primarily reached upper troposphere but only nominal amount managed penetrate tropopause. Only one occultation captured elevated concentrations burning products on July 30th, back forward trajectories place source fire Yukon. However, aerosol measurements indicate any made it past tropopause did not last long enough significantly perturb composition. While work focuses given extensive area, pyroCbs at other longitudes (e.g. Siberia) are compositional analysis. results highlight despite formation many major wildfires, capable penetrating rare; turn means even massive is necessarily indicator effects.

Язык: Английский

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Comment on egusphere-2024-353

Опубликована: Март 22, 2024

Abstract. Pyrocumulonimbus clouds (pyroCbs) generated by intense wildfires can serve as a direct pathway for the injection of aerosols and gaseous pollutants into lower stratosphere, resulting in significant chemical, radiative, dynamical changes. Canada experienced an extremely severe wildfire season 2023, with total area burned that substantially exceeded those previous events known to have impacted stratosphere (such 2020 Australian fires). This also had record-high pyroCb activity, which raises question whether 2023 Canadian event resulted stratospheric perturbations. Here, we investigate this anomalous using retrievals from two satellite instruments, ACE-FTS (Atmospheric Chemistry Experiment – Fourier Transform Spectrometer) OMPS LP (Ozone Mapping Profile Suite Limb Profiler), determine vertical extents smoke along chemical signatures biomass burning. These data show primarily reached upper troposphere but only nominal amount managed penetrate tropopause. Only one occultation captured elevated concentrations burning products on July 30^th, back forward trajectories place source fire Yukon. However, aerosol measurements indicate any made it past tropopause did not last long enough significantly perturb composition. While work focuses given extensive area, pyroCbs at other longitudes (e.g. Siberia) are compositional analysis. results highlight despite formation many major wildfires, capable penetrating rare; turn means even massive is necessarily indicator effects.

Язык: Английский

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Antarctic polar stratospheric cloud composition as observed by ACE, CALIPSO and MIPAS

Journal of Quantitative Spectroscopy and Radiative Transfer, Год журнала: 2024, Номер 324, С. 109061 - 109061

Опубликована: Май 25, 2024

Язык: Английский

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