Finite-difference analysis of the atmosphere electric field distribution around a thunderstorm monomer
In this study, two-dimensional finite difference method (2D FDM) is adopted to simulate the electric field distribution around four typical thunderstorm monomers which have different heights, scales and charge distributions. This paper analyses the impact and its range of ground electric field caused by different thunderstorm monomers. This paper also gives a scientific definition and quantitative analysis for the detection range of ground atmospheric electric field meter which is a crucial tactical index. The results in this study have certain significance in theory and practical guidance for thunderstorm monitoring by using networking atmospheric electric field meters.
Finite-difference analysis of the potential distribution around an L-shape building base under the measurement of grounding resistance
For the first time, a three-dimensional finite difference method (3D FDM) is adopted to simulate the potential distribution during grounding resistance measurements around an L-shape building under different directions and electrodes arrangements. The results show that the distributions of zero potential region with different measurement points and measurement electrodes arrangements are strikingly different when using a straight-line-three-probes method. To obtain more accurate measurement results, scientific and suitable measurement point locations should be properly chosen for the grounding resistance measurement of L-shape buildings according to the surrounding conditions in practical measurements.
The potential vorticity flux through the Yucatan Channel and the Loop Current in the Gulf of Mexico
Two‐year‐long time series of current and density structure measurements across the Yucatan Channel's main section allow the calculation of the time‐dependent potential vorticity flux between the Gulf of Mexico and the Caribbean Sea, which is characterized by alternating periods of positive (cyclonic) and negative (anti‐cyclonic) vorticity influx. Periods of negative cumulative vorticity influx are related to the Loop Current extending into the Gulf of Mexico, whereas periods of positive cumulative vorticity influx relate to a Loop Current retraction, sometimes coincident with the shedding of an anti‐cyclonic eddy.