Lightning Activity Observed by the FengYun-4A Lightning Mapping Imager

The Lightning Mapping Imager (LMI) onboard the geostationary meteorological satelliteFengYun-4A (FY-4A) detects both intra-cloud (IC) and cloud-to-ground (CG) lightning continuously during daytime and nighttime. This study examined, for the first time, the optical characteristics and distribution of the “Event,” “Group,” and “Flash” observed by the LMI in the whole LMI observation domain. The optical properties and spatial distribution of the LMI lightning were compared with those of the Lightning Imaging Sensor on the International Space Station (ISS-LIS) based on the dataset during 2018–2020. Due to the different spatial resolutions and detection efficiencies of these two lightning imagers, the number of ISS-LIS lightning was more than that of LMI lightning. The ISS-LIS Flash duration was also larger than that of the LMI Flash. The duration, radiance, and footprint of LMI lightning in different regions were analyzed in detail based on the LMI lightning dataset in 2019. The duration and radiance of the Flash were generally less than 50–500 ms and 200 Jm−2ster−1μm−1, respectively. The footprint of Flashes was distributed from 200 to 600 km2. The number of Groups per Flash was mostly less than five. Considering the spatial distribution and temporal variations in the LMI lightning compared with the ground-based Lightning Location Network in China (LLNC), it was found that the LMI Group number was close to the LLNC CG (Cloud-to-Ground) Event number. The maximum Flash density was found in the middle and lower south of the Yangtze River and Pearl River Delta region, respectively, while the lower values were in western China, where the mean radiance per Flash was greater. There was more LMI lightning during the nighttime than that during the daytime, indicating the higher detection efficiency of the LMI in the nighttime than in the daytime.

An Integrated Use of GIS, Geostatistical and Map Overlay Techniques for Spatio-Temporal Variability Analysis of Groundwater Quality and Level in the Punjab Province of Pakistan, South Asia

The rapidly changing climatic scenario is demanding periodic evaluation of groundwater quality at the temporal and spatial scale in any region for its effectual management. The statistical, geographic information system (GIS), geostatistical, and map overlay approaches were applied for investigating the spatio-temporal variation in groundwater quality and level data of 242 monitoring wells in Punjab, Pakistan during pre-monsoon and post-monsoon seasons of the years 2015 and 2016. The analysis indicated the higher variation in data for both the seasons (pre-monsoon and post-monsoon) as coefficient of variation (CV) values were found in the range of 84–175% for groundwater quality parameters. Based on the t-test values, the marginal improvement in groundwater electrical conductivity (EC), sodium absorption ratio (SAR) and residual sodium carbonate (RSC) and decrease in groundwater level (GWL) were observed in 2016 as compared to 2015 (p = 0.05). The spatial distribution analysis of groundwater EC, SAR and RSC indicated that the groundwater quality was unfit for irrigation in the lower south-east part of the study area. The groundwater level (GWL) was also higher in that part of the study area during the pre-monsoon and post-monsoon seasons in 2015 and 2016. The overlay analysis also indicated that the groundwater EC, RSC and GWL values were higher in south-east parts of the study area during pre-monsoon and post-monsoon seasons of 2015 and 2016. Hence, there is an instant need to apply groundwater management practices in the rest of the region (especially in the lower south-east part) to overcome the future degradation of groundwater quality.

Farm-Workers Perception of Personal Protective Equipment: Case Study in the Lower South Coast, South Africa

Safety and health issues are growing concerns in the agricultural sector among farm-workers in South Africa. The current health pandemic arising from the corona virus has thrown these issues into the spotlight, and this study explored the perceived usefulness and perceived ease of using personal protective materials among farm-workers in the banana sector. Using a case study of 10 large farms in the lower south coast of South Africa, we utilized descriptive and inferential analysis to identify the demographic composition of farm-workers in the study area, examine their perception of specific personal protective materials, and determine the relationship between demographic characteristics and perception of personal protective materials. Farm-workers in the study area were found to be predominantly single black males aged between 36-55years, with no more than a primary education, with work experience of between 6-10 years and employed as unskilled farm-labourers. Perceived usefulness (83%) and perceived ease of use (79%) for personal protective materials was high. Respondents gender (p=0.012), marital status (p=0.029), level of education (p=0.035) and farm-work experience (p=0.008) were significant, while their age (p=0.057), population group (p=0.160) and work classification (p=0.203) were not found significant in determining perceived usefulness or perceived ease of use. Our study makes valuable contribution to the existing body of knowledge regarding farm-worker safety issues by exploring perception of personal protective materials.

An Intimate Economy

Alexandra Finley adds crucial new dimensions to the boisterous debate over the relationship between slavery and capitalism by placing women's labor at the center of the antebellum slave trade, focusing particularly on slave traders' ability to profit from enslaved women's domestic, reproductive, and sexual labor. The slave market infiltrated every aspect of southern society, including the most personal spaces of the household, the body, and the self. Finley shows how women’s work was necessary to the functioning of the slave trade, and thus to the spread of slavery to the Lower South, the expansion of cotton production, and the profits accompanying both of these markets. Through the personal histories of four enslaved women, Finley explores the intangible costs of the slave market, moving beyond ledgers, bills of sales, and statements of profit and loss to consider the often incalculable but nevertheless invaluable place of women's emotional, sexual, and domestic labor in the economy. The details of these women's lives reveal the complex intersections of economy, race, and family at the heart of antebellum society.

Oliver Hart and the Rise of Baptist America

Oliver Hart was arguably the most important evangelical leader of the pre-Revolutionary South. For thirty years the pastor of the Charleston Baptist Church, Hart’s energetic ministry breathed new life into that congregation and the struggling Baptist cause in the region. As the founder of the Charleston Baptist Association, Hart did more than any single person to lay the foundations for the institutional life of the Baptist South, while also working extensively with evangelicals of all denominations to spread the revivalism of the Great Awakening across the lower South. One reason for Hart’s extensive influence is the uneasy compromise he made with white Southern culture, most apparent in his willingness to sanctify rather than challenge the institution of slavery, as his more radical evangelical predecessors had done. While this capitulation gained Hart and his fellow Baptists access to Southern culture, it would also sow the seeds of disunion in the larger American denomination Hart worked so hard to construct. Oliver Hart and the Rise of Baptist America is the first modern biography of Oliver Hart, at the same time interweaving the story of the remarkable transformation of America’s Baptists across the long eighteenth century. It provides perhaps the most complete narrative of the early development of one of America’s largest, most influential, and most understudied religious groups.

Rebels in the Making

Rebels in the Making narrates and interprets secession in the fifteen slave states in 1860–1861. It is a political history informed by the socioeconomic structures of the South and the varying forms they took across the region. It explains how a small minority of Southern radicals exploited the hopes and fears of Southern whites over slavery after Lincoln’s election in November of 1860 to create and lead a revolutionary movement with broad support, especially in the Lower South. It reveals a divided South in which the commitment to secession was tied directly to the extent of slave ownership and the political influence of local planters. White fears over the future of slavery were at the center of the crisis, and the refusal of Republicans to sanction the expansion of slavery doomed efforts to reach a sectional compromise. In January 1861, six states in the Lower South joined South Carolina in leaving the Union, and delegates from the seceded states organized a Confederate government in February. Lincoln’s call for troops to uphold the Union after the Confederacy fired on Fort Sumter in April 1861 finally pushed the reluctant states of the Upper South to secede in defense of slavery and white supremacy.

The Upper South

The failure to gain the states of the Upper South when they held their secession elections in February 1861 was a major setback for the cause of secession. The seven states of the original Confederacy needed the manufacturing and white manpower of the Upper South, either to convince the North of the futility of military coercion or to be competitive should war break out. Both for its prestige and size, Virginia was the pivotal state that had to be won. As an institution, slavery was stagnant or declining across most of the Upper South, and levels of slave ownership and slaves in the population were roughly half of those in the Lower South. Secessionist appeals for the immediate need to leave the Union to protect slavery failed to gain any majority support. The conservative Whig Party was still very competitive and warned that the cotton Confederacy would push for free trade and the African slave trade, both of which would undermine the more diversified economies in the Upper South. Its leaders rallied non-slaveholders under the banner of conditional Unionism, a commitment to remain in the Union so long as concessions on slavery were granted and the North refrained from any military action against the states that had seceded. Aware of their distinctly minority status and the vulnerability of their slaves given the proximity of the free-labor Northern states, most of the slaveholders in the border slave states clung to the Union as the safest defender of their slave property.