Rainfall drives atmospheric ice-nucleating particles in the coastal climate of southern Norway

Conen, Franz; Eckhardt, Sabine; Gundersen, H. J. G.; Stohl, Andreas; Yttri, Karl Espen

doi:10.5194/acp-17-11065-2017

Cited by 27 publications

(24 citation statements)

References 45 publications

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“…Mason et al (2016) report similar observations in Alert, Canada, where 95% and 70% of INPs were found at sizes > 1 μm and > 2.5 μm in diameter, respectively, and a median diameter of approximately 3 μm for all INPs at -15 ˚C. In general, observational studies in locations outside of 5 the Arctic also report a relationship between temperature and particle size, where supermicron or coarse mode aerosols are the most proficient INPs at warmer temperatures (Conen et al, 2017;Huffman et al, 2013; references cited in Mason et al, 2016; °C and 2 × 10 -2 L -1 at −15 °C, with warm temperature INPs apparent especially for the largest sizes (i.e., 2.96 -> 12 µm (stage 15 A) and 1.21 -2.96 µm (stage B)). The onset temperatures (up to −5 °C) were also much higher during this period for the two largest size cuts of the DRUM (Figure 4), indicating a presence of biological INPs Murray et al, 2012).…”

Section: Observation Of a Shift In Springtime Inp Glaciation Temperatmentioning

confidence: 62%

Marine and terrestrial influences on ice nucleating particles during continuous springtime measurements in an Arctic oilfield location

Creamean¹,

Kirpes²,

Pratt³

et al. 2018

Preprint

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Abstract. Aerosols that serve as ice nucleating particles (INPs) have the potential to modulate cloud microphysical properties and can therefore impact cloud radiative forcing and precipitation formation processes. In remote regions such as the Arctic, aerosol-cloud interactions are severely understudied yet may have significant implications for the surface energy budget and its impact on sea ice and snow surfaces. Further, uncertainties in model representations of heterogeneous ice nucleation are a significant hindrance to simulating Arctic mixed-phase cloud processes. We present results from a campaign called INPOP (Ice Nucleating Particles at Oliktok Point), which took place at a U.S. Department of Energy Atmospheric Radiation Measurement (DOE ARM) facility in the northern Alaskan Arctic. Three time- and size-resolved aerosol impactors were deployed from 1 Mar to 31 May 2017 for offline ice nucleation and chemical analyses and were co-located with routine measurements of aerosol number, size, chemistry, and radiative properties. The largest particles (i.e., &#8805;&#8201;3&#8201;&#956;m or &#8220;coarse mode&#8221;) were the most efficient INPs. During periods with snow- and ice-covered surfaces, coarse mode INP concentrations were very low (maximum of 6&#8201;&#215;&#8201;10&#8722;4&#8201;L&#8722;1 at &#8722;15&#8201;&#176;C), but higher concentrations of warm temperature INPs were observed during late May (maximum of 2&#8201;&#215;&#8201;10&#8722;2&#8201;L&#8722;1 at &#8722;15&#8201;&#176;C). These higher concentrations were attributed to air masses originating from over sea ice leads and tundra surfaces. To our knowledge, these results represent the first INP characterization measurements in an Arctic oilfield location, and demonstrate strong influences from natural sources despite the relatively high pollution levels in this Arctic environment. Ultimately, these results can be used to evaluate the anthropogenic and natural influences on aerosol composition and Arctic cloud properties.

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Section: Observation Of a Shift In Springtime Inp Glaciation Temperatmentioning

confidence: 62%

Marine and terrestrial influences on ice nucleating particles during continuous springtime measurements in an Arctic oilfield location

Creamean¹,

Kirpes²,

Pratt³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…Precipitation and/or high relative humidity has been previously linked with increases in INPs, likely of biological origin (e.g., Conen et al, ; Prenni et al, ; Tobo et al, ; Wright et al, ). There were minor increases in INP at all temperatures following a small precipitation event early on 12 May; however this was followed the next day by another precipitation event that resulted in dramatically lower particle concentrations and a minor decrease in INPs.…”

Section: Resultsmentioning

confidence: 99%

Measurements of Ice Nucleating Particles in Beijing, China

McMeeking

Ding

et al. 2019

JGR Atmospheres

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Heterogeneous ice nucleating particle (INP) concentrations are reported for a site on the eastern margin of Beijing, China, during the period 4 May to 4 June 2018. INP concentrations were measured continuously at −20, −25, and −30 °C in a repeating cycle by a newly developed, automated continuous flow diffusion chamber, and reached concentrations as high as 2800 sL−1 during dust‐impacted periods. Study average concentrations were 70 ± 70, 230 ± 290, and 430 ± 500 sL−1 at −20, −25, and −30 °C. There was no clear relationship between pollution periods, identified based on fine‐mode particle concentration increases, and INP concentrations or characteristics. Other anthropogenic emissions, such as non‐combustion industrial or agricultural activities play an unresolved role.

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“…However, one interesting feature is the large variability in particle concentrations, particularly during late May, when hourly-averaged concentrations ranged from 13-1486, 12-1111, and 35-1182 cm −3 for the CPCu, CPCf, and UHSAS, respectively. Ambient temperature and relative humidity increased steadily over the course of the study and reached values indicative of coastal marine conditions towards the end of May (Cox et al, 2012).…”

Section: Atmospheric Conditions During Inpopmentioning

confidence: 89%

Marine and terrestrial influences on ice nucleating particles during continuous springtime measurements in an Arctic oilfield location

et al. 2018

View full text Add to dashboard Cite

Abstract. Aerosols that serve as ice nucleating particles (INPs) have the potential to modulate cloud microphysical properties and can therefore impact cloud radiative forcing (CRF) and precipitation formation processes. In remote regions such as the Arctic, aerosol–cloud interactions are severely understudied yet may have significant implications for the surface energy budget and its impact on sea ice and snow surfaces. Further, uncertainties in model representations of heterogeneous ice nucleation are a significant hindrance to simulating Arctic mixed-phase cloud processes. We present results from a campaign called INPOP (Ice Nucleating Particles at Oliktok Point), which took place at a US Department of Energy Atmospheric Radiation Measurement (DOE ARM) facility in the northern Alaskan Arctic. Three time- and size-resolved aerosol impactors were deployed from 1 March to 31 May 2017 for offline ice nucleation and chemical analyses and were co-located with routine measurements of aerosol number and size. The largest particles (i.e., ≥ 3 µm or “coarse mode”) were the most efficient INPs by inducing freezing at the warmest temperatures. During periods with snow- and ice-covered surfaces, coarse mode INP concentrations were very low (maximum of 6 × 10−4 L−1 at −15 ∘C), but higher concentrations of warm-temperature INPs were observed during late May (maximum of 2 × 10−2 L−1 at −15 ∘C). These higher concentrations were attributed to air masses originating from over open Arctic Ocean water and tundra surfaces. To our knowledge, these results represent the first INP characterization measurements in an Arctic oilfield location and demonstrate strong influences from mineral and marine sources despite the relatively high springtime pollution levels. Ultimately, these results can be used to evaluate the anthropogenic and natural influences on aerosol composition and Arctic cloud properties.

show abstract

Rainfall drives atmospheric ice-nucleating particles in the coastal climate of southern Norway

Cited by 27 publications

References 45 publications

Marine and terrestrial influences on ice nucleating particles during continuous springtime measurements in an Arctic oilfield location

Marine and terrestrial influences on ice nucleating particles during continuous springtime measurements in an Arctic oilfield location

Measurements of Ice Nucleating Particles in Beijing, China

Marine and terrestrial influences on ice nucleating particles during continuous springtime measurements in an Arctic oilfield location

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