摘要:

William L. Donn, Professor Emeritus of the Department of Earth and Planetary Sciences, City College of New York, and Special Research Scientist at Lamont‐Doherty Geological Observatory (LDGO) of Columbia University (Palisades, N.Y.), died at his home on June 30, 1987, at the age of 69. Bill demonstrated expertise in a wide range of fields, with a highly productive and creative research and writing career that included geology, oceanography, climatology, atmospheric physics, and meteorology.Donn was born in Brooklyn, N.Y., on March 2, 1918. At the tender age of 10 years, he demonstrated his love and talent for science by building a telescope with his brother, Bertram. During his undergraduate years at Brooklyn College, he switched his major from astronomy to geology. He was largely selftrained in both meteorology and oceanography, serving as head of the Meteorology Section, U.S. Merchant Marine Academy during World War II . One by‐product of these years was the textbookMeteorology—With Marine Applications, first published in 1946. This widely adopted text became a standard for a generation of mariners and college stu

ISSN:0002-8606    

DOI:10.1029/88EO00140

年代:1988

数据来源: WILEY

摘要:

The study of paleosecular variation (paleo‐SV) became a separate branch of paleomagnetism more than 2 decades ago, largely because of studies of cores from lake sediments and of archeomagnetism of baked artifacts. The great prize of these studies and of the allied studies of reversals and observatory records is a description of Earth's magnetic field and an explanation of the workings of the core dynamo. The study of Holocene and Quaternary SV continues to grow vigorously, as witnessed by several papers presented at the International Quaternary (INQUA) conference in Ottawa at the end of July 1987 and the many papers submitted at the International Association of Geomagnetism and Aeronomy (IAGA) assembly in Vancouver, Canada, in early August 198

ISSN:0002-8606    

DOI:10.1029/88EO00144

年代:1988

数据来源: WILEY

摘要:

A hot research topic in the late 1960s and early 1970s was the scanning electron microscopy (SEM) study of quartz grain textures and structures as a way of determining the transport mode and depositional environment of deposits in which they were found. An atlas byKrinsley and Doornkamp[1973] can be characterized as a culmination in quartz grain research, and the atlas byHeiken[1974] is a pioneering work on pyroclastic particles. However, interest in the field declined in the late 1970s and early 1980s, and for whatever reason (perhaps cost and nonportability of the equipment), the SEM technique never reached its full potential. Now, however, in concert with interest in other techniques (such as Fourier analysis), interest in particle analysis is increasing, largely because of the method's emerging success in volcanology. In the 1980s, SEM equipment is more readily available, a n d computerization helps reduce analysis time. The bookClastic Particlescould be the catalyst to reignite the fire beneath the subject on a much broader front than in the 1970s.

ISSN:0002-8606    

DOI:10.1029/88EO00147

年代:1988

数据来源: WILEY

摘要:

The achievements of any scientific society can be measured in a steady, slow pace of change or in major, dramatic advances. In 1987, AGU produced both kinds of achievement.The Union continued to meet obligations to member geophysicists and the geophysics community by publishing more scientific papers, holding more meetings, and reaching more people than ever before. The details of this work follow. What is not discussed here and what of course constitutes the true measure of success is the achievements of the Union's individual members and of geophysicists around the world.

ISSN:0002-8606    

DOI:10.1029/88EO00148

年代:1988

数据来源: WILEY

摘要:

The Committee on Education and Human Resources (CEHR) continued sponsorship of student travel grants, scholarships, and the Job Center in 1987, as well as taking on several new initiatives. AGU was awarded a National Science Foundation grant to provide partial support for students traveling to the International Union of Geodesy and Geophysics assembly. Some 50 students, representing all sections of AGU, received between $100 and $200 for travel assistance. CEHR also allocated AGU funds for ∼20 students to attend the AGU Spring and Fall meetings. The primary criteria for this assistance were demonstrated need and economical travel plan

ISSN:0002-8606    

DOI:10.1029/88EO00149

年代:1988

数据来源: WILEY

ISSN:0002-8606    

DOI:10.1029/EO069i017p00556-02

年代:1988

数据来源: WILEY

摘要:

The International Geomagnetic Reference Field (IGRF) is a series of mathematical models of the main geomagnetic field and its secular variation. The models themselves consist of sets of spherical harmonic (or Gauss) coefficients. The IGRF has become a widely used means of deriving values of the geomagnetic field components in, for example, studies of magnetic anomalies a n d investigations of charged particle motions in the ionosphere and the magnetosphere.Since the adoption of t h e first IGRF (IGRF 1965) by the International Association of Geomagnetism and Aeronomy (IAGA) in 1968 [IAGA Commission 2 Working Group 4, 1969], the IGRF has been revised four times, giving the IGRF 1975 [IAGA Division I Study Group on Geomagnetic Reference Fields, 1975], the third‐generation IGRF [IAGA Division I Working Group 1, 1981], the fourth‐generation IGRF [IAGA Division I Working Group 1, 1985], and the fifth‐generation IGRF which is the subject of this note. Details of the derivation of the original IGRF have been given byZmuda[1971]; interested readers should seePeddie[1982] andBarraclough[1987] for descriptions of its development up to

ISSN:0002-8606    

DOI:10.1029/88EO00146

年代:1988

数据来源: WILEY

摘要:

In August 1987, in Vancouver, Canada, almost all of those who worked in the paleomagnetic group at the University College of Rhodesia and Nyasaland, Salisbury, Southern Rhodesia (now the University of Zimbabwe, Harare, Zimbabwe) were by chance attending the International Union of Geodesy and Geophysics meeting. For 8 years (1958–1966) the scientists in this photograph, taken in Vancouver, formed one of the world's most productive research groups. The paleomagnetic data from central Africa acquired by the group still remain the cornerstone of data for the continent.The g roup was started by Ian Gough in 1958. In 1960, h e became one of the few foreign grantees of the U.S. National Science Foundation (NSF). Mike McElhinny, who took over the group following Gough's departure in 1963, also received an NSF grant. The group broke up in 1966 because of political events in Rhodesia. Since 1968, work has been kept going in that region by Dai Jone

ISSN:0002-8606    

DOI:10.1029/88EO00145

年代:1988

数据来源: WILEY