Inorganic and black carbon aerosols in the Los Angeles Basin during CalNex
Inorganic and black carbon aerosols in the Los Angeles Basin during CalNex
复制标题
DOI：
10.1029/2012jd018136
复制
发表时间：
2013-02
期刊：
影响因子：
--
通讯作者：
J. J. Ensberg-J.;J. S. Craven;A. Metcalf;J. Allan;W. Angevine;R. Bahreini;J. Brioude;Chenxia Cai;H. Coe;J. Gouw;R. Ellis;James Flynn;C. Haman;Patrick L. Hayes;Jose L. Jimenez;B. Lefer;A. Middlebrook;J. Murphy;J. A. Neuman;J. Nowak;J. M. Roberts;J. Stutz;Jonathan W. Taylor;P. Veres;J. M. Walker;J. Seinfeld
中科院分区：
文献类型：
--
作者：
J. J. Ensberg-J.;J. S. Craven;A. Metcalf;J. Allan;W. Angevine;R. Bahreini;J. Brioude;Chenxia Cai;H. Coe;J. Gouw;R. Ellis;James Flynn;C. Haman;Patrick L. Hayes;Jose L. Jimenez;B. Lefer;A. Middlebrook;J. Murphy;J. A. Neuman;J. Nowak;J. M. Roberts;J. Stutz;Jonathan W. Taylor;P. Veres;J. M. Walker;J. Seinfeld
我们评估社区多尺度空气质量（CMAQ版本4.7.1）模型的预测对一套空气和地面气象测量，气体和气溶胶相无机测量，并在南加州的黑碳（BC）测量在2010年5月/6月的CalNex现场活动。地面测量来自CalNex Pasadena地面站点，机载测量在跨学科遥控飞机研究中心（CIRPAS）海军双水獭和NOAA WP-3D飞机上进行。BC预测与帕萨迪纳地面站点和WP-3D上的观测结果基本一致，但与双水獭测量结果相比，BC预测一直被高估。根据预测的气溶胶粒径分布和AMS传输效率，对预测的无机物质量浓度进行调整是显着的。由于最近航运排放量的减少，洛杉矶硫酸盐的主要来源。盆地现在可能是长距离运输。敏感性研究表明，严重低估的氨排放，而不是排除地壳物种（Ca 2+，K+和Mg 2+），是在洛杉矶东部的测量/模型不一致的单一最大贡献者。盆地尽管夸大了氮氧化物的排放量，总硝酸盐浓度是低估，这表明一个失踪的来源HNO 3和/或高估的沉积速率。在洛杉矶的常规监测站中增加气相NH3测量和尺寸分辨测量（最大可达10 μm）硝酸盐和各种阳离子（如Na+、Ca 2+、K+）。盆地将大大有助于解释精细和粗糙无机气溶胶的日常波动。
We evaluate predictions from the Community Multiscale Air Quality (CMAQ version 4.7.1) model against a suite of airborne and ground‐based meteorological measurements, gas‐ and aerosol‐phase inorganic measurements, and black carbon (BC) measurements over Southern California during the CalNex field campaign in May/June 2010. Ground‐based measurements are from the CalNex Pasadena ground site, and airborne measurements took place onboard the Center for Interdisciplinary Remotely‐Piloted Aircraft Studies (CIRPAS) Navy Twin Otter and the NOAA WP‐3D aircraft. BC predictions are in general agreement with observations at the Pasadena ground site and onboard the WP‐3D, but are consistently overpredicted when compared to Twin Otter measurements. Adjustments to predicted inorganic mass concentrations, based on predicted aerosol size distributions and the AMS transmission efficiency, are shown to be significant. Owing to recent shipping emission reductions, the dominant source of sulfate in the L.A. Basin may now be long‐range transport. Sensitivity studies suggest that severely underestimated ammonia emissions, and not the exclusion of crustal species (Ca2 +, K+, and Mg2 +), are the single largest contributor to measurement/model disagreement in the eastern part of the L.A. Basin. Despite overstated NOx emissions, total nitrate concentrations are underpredicted, which suggests a missing source of HNO3 and/or overprediction of deposition rates. Adding gas‐phase NH3 measurements and size‐resolved measurements, up to 10 μm, of nitrate and various cations (e.g. Na+, Ca2 +, K+) to routine monitoring stations in the L.A. Basin would greatly facilitate interpreting day‐to‐day fluctuations in fine and coarse inorganic aerosol.