Search Results

You are looking at 1 - 10 of 11 items for :

  • Southern Ocean x
  • Aerosol-Cloud-Precipitation-Climate Interaction x
  • All content x
Clear All
Peter J. Marinescu, Susan C. van den Heever, Max Heikenfeld, Andrew I. Barrett, Christian Barthlott, Corinna Hoose, Jiwen Fan, Ann M. Fridlind, Toshi Matsui, Annette K. Miltenberger, Philip Stier, Benoit Vie, Bethan A. White, and Yuwei Zhang

ACPC MIP simulations are based on a case of scattered convective clouds that developed near Houston on 19–20 June 2013. Figure 1 shows several radar and satellite snapshots during this event. In the late morning hours, there were weak, scattered, isolated convective clouds along a trailing front that extended zonally across the southeastern United States, into southern Louisiana and eastern Texas. With increased insolation in the late morning and early afternoon hours, the convection associated

Open access
Jie Peng, Zhanqing Li, Hua Zhang, Jianjun Liu, and Maureen Cribb

, extent, and microphysics) and their diurnal variations. A call for further studies to investigate this net effect was made at a recent World Climate Research Programme Climate Science meeting ( Rosenfeld et al. 2013 ). Niu and Li (2012) analyzed 1 yr of A-Train ( L’Ecuyer and Jiang 2010 ) satellite data and found systematic variations in cloud-top height and thickness associated with aerosol loading over the global tropical oceans and land. These dependencies are consistent with the findings of Li

Full access
Christina S. McCluskey, Thomas C. J. Hill, Camille M. Sultana, Olga Laskina, Jonathan Trueblood, Mitchell V. Santander, Charlotte M. Beall, Jennifer M. Michaud, Sonia M. Kreidenweis, Kimberly A. Prather, Vicki Grassian, and Paul J. DeMott

-relevant cloud properties in high-latitude oceanic regions are misrepresented in global models in remote regions like the Southern Ocean (e.g., Franklin et al. 2013 ; McCoy et al. 2015 ). Marine INPs may be particularly relevant to ice-phase transitions in remote oceanic regions, such as the Southern Ocean ( Burrows et al. 2013 ), because of a lack of other INP sources (e.g., mineral dust) and a high prevalence of supercooled liquid clouds ( Huang et al. 2015 ). However, few studies have identified the

Full access
Christina S. McCluskey, Thomas C. J. Hill, Francesca Malfatti, Camille M. Sultana, Christopher Lee, Mitchell V. Santander, Charlotte M. Beall, Kathryn A. Moore, Gavin C. Cornwell, Douglas B. Collins, Kimberly A. Prather, Thilina Jayarathne, Elizabeth A. Stone, Farooq Azam, Sonia M. Kreidenweis, and Paul J. DeMott

supercooled liquid ( Vali et al. 2015 )] ranging from 3 to 250 m −3 (median 14 m −3 ) over the Southern Ocean ( Bigg 1973 ). More recently, DeMott et al. (2015) compared number concentrations and surface site densities of aerosols observed in some marine environments with laboratory studies where generated sea spray was the only INP source. Their data suggest that marine INPs are distinctly less efficient than land-sourced INPs such that the ice nucleating ability of marine aerosol needs to be

Full access
Jianjun Liu, Zhanqing Li, and Maureen Cribb

indirect effect; Albrecht 1989 ). AIE are the dominant contributors to the overall aerosol radiative forcing in most climate models yet are poorly constrained and can vary by a factor of 5 across different models ( Quaas et al. 2009 ; Wood et al. 2015 ). Marine boundary layer (MBL) clouds are common over the subtropical and midlatitude oceans and are particularly susceptible to perturbations in aerosols ( Wood et al. 2015 ). These clouds strongly influence regional and global climate systems

Full access
Jiwen Fan, Yuan Wang, Daniel Rosenfeld, and Xiaohong Liu

situ measurements. The higher frequency of lightning activities over land than that over ocean can be partially caused by the land–sea contrast of aerosol concentrations ( Seinfeld and Pandis 2006 ). Over megacities in southern Brazil, South Korea, and southern China, lightning density were positively correlated with the measured particulate matter (PM) concentrations ( Naccarato et al. 2003 ; Kar et al. 2009 ; Y. Wang et al. 2011 ). Lightning enhancement induced by aerosols typically occurs over

Full access
Tianmeng Chen, Jianping Guo, Zhanqing Li, Chuanfeng Zhao, Huan Liu, Maureen Cribb, Fu Wang, and Jing He

clouds over the Gulf and the southern United States ( Yuan et al. 2008 ), deep convective clouds (DCC) over the Atlantic Ocean ( Koren et al. 2005 ) using satellite data and the global tropics ( Niu and Li 2012 ; Peng et al. 2016 ) using A-Train satellite data, and for all types of clouds using 10 years of long-term ground observations made at the Southern Great Plains site ( Li et al. 2011 ), among others. For all such studies, one of the most challenging tasks is to untangle the effects of

Full access
Yvonne Boose, Zamin A. Kanji, Monika Kohn, Berko Sierau, Assaf Zipori, Ian Crawford, Gary Lloyd, Nicolas Bukowiecki, Erik Herrmann, Piotr Kupiszewski, Martin Steinbacher, and Ulrike Lohmann

coupled plasma mass spectrometer (MC-ICP-MS; Neptune Plus). The marine ( 87 Sr/ 86 Sr) ratio is known to be homogeneous in the ocean with a value of 0.709 17 ( Hodell et al. 1990 ). Basalt and volcanic rocks have lower values, whereas granite rocks and dust from the Sahara have higher ratio values ( Capo et al. 1998 , and references therein). To get an indication on the geochemical origin of the aerosol sampled, we use the δ 87 parameter: with ( 87 Sr/ 86 Sr) marine = 0.709 17. It describes how

Full access
Wojciech W. Grabowski

, as a result of meteorological conditions covarying with the aerosols. One example of the flawed interpretation of cloud, aerosol, and meteorological observations is the analysis of the data collected at the DOE Atmospheric Radiation Measurement (ARM) Program Southern Great Plains (SGP) site presented in Li et al. (2011) . The data clearly show correlation between clouds and aerosols, but Li et al. (2011) go one step further and suggest that there is a causal relationship between the two (e

Full access
Yun Lin, Yuan Wang, Bowen Pan, Jiaxi Hu, Yangang Liu, and Renyi Zhang

clouds and their association with aerosols, a field campaign, Routine ARM Aerial Facility (AAF) Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations (RACORO) organized by DOE has been conducted at the ARM Southern Great Plains (SGP) site ( Vogelmann et al. 2012 ). The five-month campaign provides a first extended-term airborne and ground-based cloud and aerosol information for various continental boundary layer clouds. The RACORO campaign has already been examined by some

Full access