Comment on egusphere-2023-2953 DOI Creative Commons

Matthew Boyer,

Diego Aliaga, Lauriane L. J. Quéléver

et al.

Published: May 7, 2024

Abstract. In this study, we present and analyze the first continuous timeseries of relevant aerosol precursor vapors from central Arctic during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. These include sulfuric acid (SA), methanesulfonic (MSA), iodic (IA). We use FLEXPART simulations, inverse modeling, sulfur dioxide (SO2) mixing ratios, chlorophyll-a (chl-a) observations to interpret 20 seasonal variability vapor concentrations identify dominant sources. Our results show that both natural anthropogenic sources are SA in Arctic, but associated with haze most prevalent. MSA an order magnitude higher polar day than night due changes biological activity. Peak were observed May, which corresponds timing annual peak chl-a north 75° N. IA exhibit two distinct peaks 25 year: a spring secondary autumn, suggesting depend on solar radiation sea ice conditions. general, cycles SA, MSA, Ocean related conditions, expect environment will affect these future. The subsequent influence processes remains uncertain, highlighting need continued Arctic.

Language: Английский

Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic DOI Creative Commons
Ruth Price, Andrea Baccarini, Julia Schmale

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(5), P. 2927 - 2961

Published: March 6, 2023

Abstract. In the Arctic, aerosol budget plays a particular role in determining behaviour of clouds, which are important for surface energy balance and thus region’s climate. A key question is extent to cloud condensation nuclei high Arctic summertime boundary layer controlled by local emission formation processes as opposed transport from outside. Each these sources likely respond differently future changes ice cover. Here we use global model observations ship aircraft field campaigns understand source late summer. We find that particles formed remotely, i.e. at latitudes outside dominant Aitken mode during sea melt period up end August. Particles such remote sources, entrained into free troposphere, account nucleation particle concentrations otherwise underestimated model. This declines photochemical rates decrease towards summer largely replaced new driven iodic acid created freeze-up. Such increases simulated 2 orders magnitude freeze-up consistent with strong fluctuations occur September. Our results suggest high-Arctic regime shift summer, only after this do become sensitive processes.

Language: Английский

Citations

4
Tethered balloon measurements reveal enhanced aerosol occurrence aloft interacting with Arctic low-level clouds DOI Creative Commons
Christian Pilz, John J. Cassano, Gijs de Boer

et al.

Elementa Science of the Anthropocene, Journal Year: 2024, Volume and Issue: 12(1)

Published: Jan. 1, 2024

Low-level clouds in the Arctic affect surface energy budget and vertical transport of heat moisture. The limited availability cloud-droplet-forming aerosol particles strongly impacts cloud properties lifetime. Vertical particle distributions are required to study aerosol–cloud interaction over sea ice comprehensively. This article presents vertically resolved measurements number concentrations sizes using tethered balloons. data were collected during Multidisciplinary drifting Observatory for Study Climate expedition summer 2020. Thirty-four profiles concentration observed 2 size ranges: 12–150 nm (N12−150) above 150 (N>150). Concurrent balloon-borne meteorological provided context continuous through cloudy atmospheric boundary layer. Radiosoundings, remote sensing data, 5-day back trajectories supplemented analysis. majority showed more lowest temperature inversion, on average, double compared below. Increased N12−150 up 3,000 cm−3 free troposphere low-level related secondary formation. Long-range pollution increased N>150 310 a warm, moist air mass. Droplet activation inside caused reductions by 100%, while decrease was less than 50%. When thermodynamically coupled with surface, 5 times higher values below cloud-capping inversion. Enhanced interacting advected inversion from beyond edge when decoupled surface. Vertically discontinuous suggest that emitted at not transported these conditions. It is concluded cloud-surface coupling state tropospheric abundance crucial assessing ice.

Language: Английский

Citations

1
Aerosol size distribution properties associated with cold-air outbreaks in the Norwegian Arctic DOI Creative Commons
A. Williams, Jeramy L. Dedrick, Lynn M. Russell

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(20), P. 11791 - 11805

Published: Oct. 23, 2024

Abstract. The aerosol particles serving as cloud condensation and ice nuclei contribute to key processes associated with cold-air outbreak (CAO) events but are poorly constrained in climate models due sparse observations. Here we retrieve number size distribution modes from measurements at Andenes, Norway, during the Cold-Air Outbreaks Marine Boundary Layer Experiment (COMBLE) Zeppelin Observatory, approximately 1000 km upwind Andenes Svalbard. During CAO sea-spray-mode concentration is correlated strong over-ocean winds a mean of 8±4 cm−3 that 71 % higher than non-CAO conditions. Additionally, Hoppel minimum diameter 6 nm smaller conditions, though estimated supersaturation lower, likely activated in-cloud 109±61 no statistically significant difference 99±66 cm−3. For trajectories between Observatory upwind-to-downwind change largest for accumulation mode decrease 93±95 cm−3, attributable primarily precipitation scavenging. These characteristic properties distributions provide guidance evaluating aerosol–cloud interaction models.

Language: Английский

Citations

1
The annual cycle and sources of relevant aerosol precursor vapors in the central Arctic during the MOSAiC expedition DOI Creative Commons

Matthew Boyer,

Diego Aliaga, Lauriane L. J. Quéléver

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(22), P. 12595 - 12621

Published: Nov. 14, 2024

Abstract. In this study, we present and analyze the first continuous time series of relevant aerosol precursor vapors from central Arctic (north 80° N) during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. These include sulfuric acid (SA), methanesulfonic (MSA), iodic (IA). We use FLEXPART simulations, inverse modeling, sulfur dioxide (SO2) mixing ratios, chlorophyll a (chl a) observations to interpret seasonal variability in vapor concentrations identify dominant sources. Our results show that both natural anthropogenic sources are SA Arctic, but associated with haze most prevalent. MSA an order magnitude higher polar day than night due changes biological activity. Peak were observed May, which corresponds timing annual peak chl north 75° N. IA exhibit two distinct peaks year, namely spring secondary autumn, suggesting depend on solar radiation sea ice conditions. general, cycles SA, MSA, Ocean related conditions, expect environment will affect these future. The subsequent influence processes remains uncertain, highlighting need continued Arctic.

Language: Английский

Citations

1
Revealing the chemical characteristics of Arctic low-level cloud residuals – in situ observations from a mountain site DOI Creative Commons
Yvette Gramlich, Karolina Siegel, Sophie L. Haslett

et al.

Published: Dec. 14, 2022

Abstract. The role aerosol chemical composition plays in Arctic low-level cloud formation is still poorly understood. In this study we address issue by combining situ observations of the characteristics residuals (dried liquid droplets or ice crystals) and particles from Zeppelin Observatory Ny-Ålesund, Svalbard (approx. 480 m a. s. l.). These measurements were part one-year long Ny-Ålesund Aerosol Cloud Experiment 2019–2020 (NASCENT). To obtain at molecular level, deployed a Filter Inlet for Gases AEROsols coupled to Chemical Ionization Mass Spectrometer (FIGAERO-CIMS) with iodide as reagent ion behind Ground-based Counterflow Virtual Impactor (GCVI). station was enshrouded clouds roughly 15 % time during NASCENT, out which analyzed 14 events between December 2019 2020. During entire year, shows contributions oxygenated organic compounds, including organonitrates, traces biomass burning tracer levoglucosan. summer, methanesulfonic acid (MSA), an oxidation product dimethyl sulfide (DMS), large sampled mass, indicating marine natural sources condensation nuclei (CCN) nucleating (INP) mass sunlit year. addition, also find inorganic acids nitric sulfuric acid, outstanding high absolute signals one residual sample spring late summer (May 21 September 12, 2020), probably caused anthropogenic sulfur emissions near Barents Kara Sea. particular event, on May 18, 2020, air origin did not change before after cloud. We therefore chose it case investigate impact physicochemical properties. show that overall similar before, during, cloud, have already undergone several cycles processing being measured Zeppelin, and/or timescales observed fraction can be neglected. Meanwhile there are average fewer particles, but relatively more accumulation mode Comparing signal sulfur-containing compounds aerosols cloud-free conditions, has higher relative contribution compared observe increase particulate MSA due Overall, composition, especially residuals, reflects general population well. Our results thus suggest most serve seeds Arctic.

Language: Английский

Citations

5
Impact of varied fog collector designs on fog and rainwater harvesting under fluctuating wind speed and direction DOI

Mohammad Mosa,

Farid Radwan,

Hussein M. Al-Ghobari

et al.

Earth Science Informatics, Journal Year: 2023, Volume and Issue: 17(1), P. 617 - 631

Published: Dec. 18, 2023

Language: Английский

Citations

2
Large-eddy simulation of a two-layer boundary-layer cloud system from the Arctic Ocean 2018 expedition DOI Creative Commons
Ines Bulatovic, Julien Savre, Michael Tjernström

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(12), P. 7033 - 7055

Published: June 26, 2023

Abstract. Climate change is particularly noticeable in the Arctic. The most common type of cloud at these latitudes mixed-phase stratocumulus. These clouds occur frequently and persistently during all seasons play a critical role Arctic energy budget. Previous observations central (north 80∘ N) have shown high occurrence prolonged periods shallow, single-layer stratocumulus top boundary layer (BL; altitudes ∼ 300 to 400 m). However, recent from summer 2018 instead showed prevalence two-layer boundary-layer system. Here we use large-eddy simulation examine maintenance one systems observed sensitivity layers different micro- macro-scale parameters. We find that model generally reproduces thermodynamic structure well, with two near-neutrally stratified BL caused by low (located within first few hundred meters) capped lower-altitude temperature inversion an upper (based around kilometer or slightly higher) main BL. simulated persistent unless there are aerosol number concentrations (≤ 5 cm−3), which cause dissipate, large-scale wind speeds (≥ 8.5 m s−1), erode lower related layer. changes alter both short- longwave radiative effect surface. This results net modeled system, can impact surface melting freezing. findings highlight importance better understanding representing sources sinks over Ocean. Furthermore, they underline significance meteorological parameters, such as speed, for maintaining encountered atmosphere

Language: Английский

Citations

1
Contribution of fluorescent primary biological aerosol particles to low-level Arctic cloud residuals DOI Creative Commons
Gabriel Pereira Freitas, Ben Kopec, Kouji Adachi

et al.

Published: Dec. 5, 2023

Abstract. Mixed-phase clouds (MPC) are key players in the Arctic climate system due to their role modulating solar and terrestrial radiation. Such radiative interactions critically rely on ice content of MPC which, turn, also depend availability nucleating particles (INP). INP sources concentrations poorly understood Arctic. Recently, active at high temperatures were associated with presence primary biological aerosol (PBAP). Here, we investigated for a full year abundance variability fluorescent PBAP (fPBAP) within cloud residuals, directly sampled by multiparameter bioaerosol spectrometer coupled ground-based counterflow virtual impactor inlet Zeppelin Observatory (475 m asl), Ny-Ålesund, Svalbard. fPBAP (10-3–10-2 L-1) contributions coarse-mode (0.1 1 every 103 particles) residuals found be close those expected high-temperature INP. Transmission electron microscopy confirmed fPBAP, most likely bacteria, residual samples. Seasonally, our results reveal an elevated summer. Parallel water vapor isotope measurements point towards link between summer regionally sourced air masses. Low-level predominantly observed beginning end summer, one explanation is existence In this study, present observational evidence that may play important determining phase low-level clouds. These findings have potential implications future description condensation nuclei given ongoing changes hydrological biogeochemical cycles will influence flux

Language: Английский

Citations

1
The annual cycle and sources of relevant aerosol precursor vapors in the central Arctic DOI Creative Commons

Matthew Boyer,

Diego Aliaga, Lauriane L. J. Quéléver

et al.

Published: Jan. 15, 2024

Abstract. In this study, we present and analyze the first continuous timeseries of relevant aerosol precursor vapors from central Arctic during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. These include sulfuric acid (SA), methanesulfonic (MSA), iodic (IA). We use FLEXPART simulations, inverse modeling, sulfur dioxide (SO2) mixing ratios, chlorophyll-a (chl-a) observations to interpret 20 seasonal variability vapor concentrations identify dominant sources. Our results show that both natural anthropogenic sources are SA in Arctic, but associated with haze most prevalent. MSA an order magnitude higher polar day than night due changes biological activity. Peak were observed May, which corresponds timing annual peak chl-a north 75° N. IA exhibit two distinct peaks 25 year: a spring secondary autumn, suggesting depend on solar radiation sea ice conditions. general, cycles SA, MSA, Ocean related conditions, expect environment will affect these future. The subsequent influence processes remains uncertain, highlighting need continued Arctic.

Language: Английский

Citations

0
Comment on egusphere-2023-2600 DOI Creative Commons
Gabriel Pereira Freitas, Ben Kopec, Kouji Adachi

et al.

Published: Jan. 31, 2024

Abstract. Mixed-phase clouds (MPC) are key players in the Arctic climate system due to their role modulating solar and terrestrial radiation. Such radiative interactions critically rely on ice content of MPC which, turn, also depend availability nucleating particles (INP). INP sources concentrations poorly understood Arctic. Recently, active at high temperatures were associated with presence primary biological aerosol (PBAP). Here, we investigated for a full year abundance variability fluorescent PBAP (fPBAP) within cloud residuals, directly sampled by multiparameter bioaerosol spectrometer coupled ground-based counterflow virtual impactor inlet Zeppelin Observatory (475 m asl), Ny-Ålesund, Svalbard. fPBAP (10-3–10-2 L-1) contributions coarse-mode (0.1 1 every 103 particles) residuals found be close those expected high-temperature INP. Transmission electron microscopy confirmed fPBAP, most likely bacteria, residual samples. Seasonally, our results reveal an elevated summer. Parallel water vapor isotope measurements point towards link between summer regionally sourced air masses. Low-level predominantly observed beginning end summer, one explanation is existence In this study, present observational evidence that may play important determining phase low-level clouds. These findings have potential implications future description condensation nuclei given ongoing changes hydrological biogeochemical cycles will influence flux

Language: Английский

Citations

0