GLD360 Performance relative to TRMM/LIS

16 October 2017

Vaisala GLD360 lightning observations are compared with total lightnign measurements made by LIS on the TRMM satellite.

S. Rudlosky, M. J. Peterson, and D. Kahn

Picture Caption: 

Lightning Imaging Sensor flash counts during (a) 2012, (b) 2013, (c) 2014, and (d) 2012–14, along with the GLD360 stroke counts during (e) 2012, (f) 2013, (g) 2014, and (h) 2012–14. The color scale differs for (d) and (h), with colors representing 3 times the values depicted in (a)–(c) and (e)–(g). The limited LIS view time accounts for the much smaller LIS flash counts.

Mapping Lightning Flashes from Orbit

16 March 2017

Lightning imagers on satellites are useful for measuring total lightning production with a high detection efficiency. They can also be used to document the evolution of individual lightning flashes and probe their structure in some cases. This study uses Lightning Imaging Sensor (LIS) measurements to identify what level of spatial and temporal development that can be detected by lightning imagers.

M. J. Peterson, S. Rudlosky, and W. Deierling

Journal of Geophysical Research, PREPARING SUBMISSION

Picture Caption: 

Example LIS Flash with Branching. Event pixels and group centers in a convective-to-stratiform flash. Greyscale: LIS group number (grey: first, white: last)

The Evolution and Structure of Exceptional LIS Lightning Flashes

16 March 2017

The World Meteorological Organization (WMO) recently accepted new records for the longest length and longest duration of a single lightning flash. These record flashes were observed by Lightning Mapping Array (LMA) systems that monitor the VHF radio band for atmospheric sources. Lightning imagers provide a differing view on the properties and evolution of the flash. What are the flash extremes in the properties of optical lightning flashes?

M. J. Peterson, S. Rudlosky, and W. Deierling

Journal of Geophysical Research, FINALIZING SUBMISSION

Picture Caption: 

Example LIS Superbolt. Event pixels and group centers in a superbolt with continuing current. Greyscale: LIS group number (grey: first, white: last)

Reconstruction of the Broader Tropical Chimneys using TRMM-Retrieved Wilson Currents

16 March 2017

The baseline 20 km run of the Peterson et al. (2015) electric field retrieval algorithm on the Tropical Rainfall Measuring Mission (TRMM) dataset is used to rank the three tropical chimney regions. Unlike previous studies that have looked only at land-based thunderstorms, we consider thunderstorms and Electrified Shower Clouds (ESCs) in land and ocean regions across longitude quadrants that encompass each of the three chimneys – the Americas, Africa, and Asia – and the Pacific Ocean.

M. J. Peterson, W. Deierling, C. Liu, D. Mach, and C. Kalb

Geophysical Research Letters, PREPARING SUBMISSION

Picture Caption: 

Diurnal Cycle of Total Mean Current. Distributions of total mean Wilson currents across the tropics (solid, thick), the Americas (solid, thin), Africa, (dot-dashed), Asia (dashed), and the Pacific (dotted).

A TRMM Survey of Retrieved Electric Fields and Wilson Currents above Thunderstorms and Shower Clouds

16 March 2017

A database of Radar Precipitation Features (RPFs) is constructed for electrified clouds. This Electrified Cloud Features (ECF) database includes only those RPFs with pixels that the Tropical Rainfall Measuring Mission (TRMM) passive microwave electric field algorithm considers to be electrified (20 km electric fields > 0 Vm-1).

M. J. Peterson, W. Deierling, C. Liu, D. Mach, and C. Kalb

Journal of Geophysical Research, FINALIZING SUBMISSION

Picture Caption: 

CDF of GEC Contribution by Current. Distributions for thunderstorms (thick) and shower clouds (thin). Also, separately for land (solid), coastal ocean (dot-dashed), and open ocean (dashed)

A TRMM/GPM Retrieval of the Total Mean Generator Current for the Global Electric Circuit

16 March 2017

Retrieved electric fields from Tropical Rainfall Measuring Mission (TRMM) and Global Precipitation Measurement (GPM) satellite observations are used to calculate the total mean Wilson current that powers the Global Electric Circuit (GEC). The long record of TRMM data is also used to examine the temporal variability of the GEC source current on time scales that range from one day to more than a decade.

M. J. Peterson, W. Deierling, C. Liu, D. Mach, and C. Kalb

Picture Caption: 

Global GEC Current Sources. Global distribution of total mean Wilson currents from electrified weather as a fraction of the total for comparison with other metrics

Performance Assessment of the Passive Microwave Electric Field Retrieval Algorithm with TRMM Satellite Observations

16 March 2017

Peterson et al. (2015) developed an algorithm for estimating the electric field vector at any point above an electrified cloud from passive microwave observations. It is constructed using NASA ER-2 high-altitude aircraft electric field and passive microwave measurements. The present study constructs a version of the Peterson et al. (2015) algorithm for use with Precipitation Measurement Mission (PMM) satellite datasets.

M. J. Peterson, W. Deierling, C. Liu, D. Mach, and C. Kalb

Journal of Atmospheric and Oceanic Technology, UNDER REVIEW

Picture Caption: 

Example TRMM MCS. TMI 85 GHz brightness temperatures (top), and electric field strength and horizontal vectors (bottom).

The Properties of Optical Lightning Flashes and the Clouds They Illuminate

16 March 2017

Why do lightning flashes illuminate the clouds in the way they do? Some flashes produce bright stationary optical pulses that illuminate a large fraction of the storm. Others are dim and move around in the cloud as they evolve. The Lightning Imaging Sensor onboard the Tropical Rainfall Measuring Mission (TRMM) satellite surveyed lightning flashes of all shapes, sizes, and radiances across the tropics. Because LIS is an optical imager, however, it is unclear to what extent the observed characteristics of LIS flashes are influenced by scattering in the surrounding cloud.

M. J. Peterson, W. Deierling, C. Liu, D. Mach, and C. Kalb

Picture Caption: 

Example Propagating LIS Flash. Greyscale: LIS group number (grey: first group, white: last group). Color scale: VIRS 10.8 µm Tb.

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