Statistics regarding the fractional participation of women in meteorology/atmospheric sciences gathered by the AMS are quite similar to those based on annual National Science Foundation (NSF) surveys. The absolute numbers in the biennial AMS/UCAR survey of academic departments for the *Curricula* series ceased being useful by around 2005, when many departments stopped participating fully, but numbers from less-frequent direct AMS membership surveys have been increasing. Despite the limitations of the AMS data, the NSF statistics confirm conclusions from an earlier analysis of AMS data. Both numbers and percentages are required to tell the evolving story of the atmospheric sciences' “pipeline.” Furthermore, after correction of an error regarding the AMS statistics in our 2010 paper, both NSF and AMS data show the same increase in the proportion of women graduate students in the field over the last four decades, as well as an apparent leveling off at approximately one-third.

A 2010 *Bulletin* article by Hartten and LeMone (hereafter Hartten-LeMone) used demographic data collected by 3 AMS member surveys, conducted over a span of 12 years, to describe the time-varying nature of the field of meteorology/atmospheric sciences in terms of gender and race. The AMS survey data were augmented by other datasets collected either by the AMS and UCAR or by authors of *Bulletin* articles. These ancillary surveys were assumed to be broadly representative of the field, with a strong but not exclusive emphasis on the United States. Two questions typically arise with data such as these: Are surveys conducted by or on behalf of the AMS truly representative? And can we use occasional surveys to detect trends within the field, so as to possibly make projections for the short-term future? Data from annual National Science Foundation (NSF) surveys of graduate students and academic degrees granted can help answer both questions.

Statistics compiled by NSF indicate that the number of female graduate students in the atmospheric sciences has increased fairly steadily since the 1972–73 academic year (Fig. 1, top). The percentage of women has increased as well, with the sharpest increase (from about 1995–2003) coinciding with a drop in the number of male graduate students (1993–2001) that was followed by a sluggish recovery until jumping back to pre-1993 levels with the onset of the “Great Recession” in 2008. This increase in the percentage of women caused in part by a decrease in the number of men was also noted in some subsets of the 2005 AMS Member Survey data presented in Hartten-LeMone (c.f. their Figs. 3 and 4). Thus, is it not surprising that the data in Fig. 1 (bottom), based on a corrected version of Hartten-LeMone's Fig. 8, follow the five-year running mean NSF percentages almost exactly (Fig. 1, bottom). See the sidebar for an explanation of the corrected plot.

From an “outcomes” perspective, the NSF data appear to support the representativeness of gender percentages based on the AMS survey data. What about from a “sampling” perspective? The combined number of male and female graduate students counted by NSF during several years, including those plotted in the corrected Hartten-LeMone figure, is given in Table 1,^{1} as is the number of atmospheric sciences graduate students from AMS-related sources. Before comparing the two datasets, some comments on the AMS numbers are in order.

Two errors in the statistics presented in Hartten-LeMone regarding the proportion of women graduate students in meteorology have recently been brought to our attention. Here we correct those errors and clarify some details about the ancillary datasets involved.

Figure 8 of Hartten-LeMone overestimates the percentage of women graduate students in the atmospheric sciences for the years labeled 1997 and 2004; it also assigns the wrong dates to those percentages. Figure SB1, the corrected and updated version, reveals smaller percentages for 1998–99^{a} and 2005–06^{b} (28% and 37%, respectively) than in the original figure (39% and 50%). The incorrect percentages were caused by a purely arithmetical problem. The corrected values and dates do not change the fundamental conclusion drawn by Hartten-LeMone: the proportion of women atmospheric scientists in graduate school has increased considerably since the very small values recorded by Simpson and LeMone in their 1974 *Bulletin* article. The correction does show that the change over the last few decades has been less dramatic than originally thought, more linear than exponential.

In Table 1, AMS numbers are of three types: those based on direct member surveys, those based on surveys of university departments and published in the *Curricula* series, and those based on ad hoc surveys published in the *Bulletin*. The *Curricula* numbers in the Table exceed 1,000 until 1993; these drop below 1,000 by 1998, and to 550 by 2004, reflecting fewer universities reporting. Moreover, the methods for deriving the final numbers differed slightly. As detailed in Table 1, the 1992 data in Fig. SB1 (and Fig. 8 of Hartten-LeMone) were gleaned by the second author from individual university listings in the *Curricula*. Some filtering was done to eliminate academic departments that clearly did not involve atmospheric sciences, but it is possible some oceanographers and hydrologists were included. Based on *Curricula* summaries, the data for 1998 and 2005 explicitly applied to the atmospheric sciences.^{2} However, only a modest subset of the responding university departments reported fully. For 1998, M.S. and Ph.D. students were reported by gender for only 35 of the 55 institutions reporting M.S. students and the 46 reporting Ph.D. students. The situation is even worse for 2005; out of only 30 institutions reporting demographic data on graduate students, just 16 reported M.S. and M.A. students by gender while all 30 institutions reported Ph.D. students by gender. Fortunately, increased response to the member surveys has partially compensated for the drop in response in the *Curricula*, as illustrated by the increase in the number of graduate students participating in the 2005 AMS Member Survey relative to the 1999 survey.

The net effects of differing methods and changing participation in AMS-related estimates are total numbers that vary with respect to the more stable NSF totals, but female-to-total ratios that are similar. The number of graduate students counted by the *Curricula* was within 15% of NSF values in the 1982 and 1990s' surveys but was only 52% of NSF values in 2005. The 2005 AMS Member Survey number, at 48% of NSF values, was comparable to the diminished *Curricula* number. The number of graduate students calculated from Simpson-LeMone for 1972 was, like the *Curricula* estimates from 1980 and 1992, 15%–20% higher than NSF values. However, Fig. 1 shows that the *female proportions from all these sources are very similar in any given year*, in spite of the sometimes large sample differences.

Finally, we examine trends based on annual NSF statistics regarding the number of degrees in atmospheric sciences granted to men and to women.^{3 }Figure 2 shows increasing numbers and percentages for women in all three degree categories. There was about 3 times as much growth from 1990 to 2010 as in the previous 24 years—two-thirds of it in the 2000s. While the *proportion of women increases* with time for all degrees, it is again influenced by *lower numbers of men receiving master's degrees after the peak in 1984*. If we compare the trends for the different degree categories after 1984, there are some interesting differences. For bachelor's degree recipients, there is a sustained recovery until 2007, while the master's degrees recipients drop until 2002 and never return to 1984 levels. The Ph.D. recipient curve shows a slow and choppy increase through the period. The relatively sluggish growth at the master's level suggests that more bachelor's degree recipients are entering the workforce, and/or that fewer students from other undergraduate fields are pursuing graduate study in the atmospheric sciences at the master's level. Surprisingly, the difference between the number of men and women receiving bachelor's or doctoral degrees has remained fairly constant for almost five decades.

The consistency in the *percentages* of women revealed in Fig. 1 (bottom), despite different methodologies and only partially overlapping samples, is encouraging and indicates that the NSF data are sufficient to provide the AMS with current gender demographics among degree recipients and graduate students. We cannot say if this applies to racial demographics, where the ratios are much smaller and the AMS data record is shorter, or for those who are finished with their education and no longer sampled by NSF. However AMS surveys can—as they have in the past—be used to find out in more depth how all meteorologists and atmospheric scientists are doing as they progress through their careers, and how the AMS can be more relevant to them.

## ACKNOWLEDGMENTS

We are grateful to Xiaoqing Wu and Bill Gallus of Iowa State University for surveying colleagues and then expressing their skepticism to us regarding the 50% number for 2004 in Fig. 8 of Hartten-LeMone; and to Rajul Pandya of UCAR for directing us to the most recent NSF statistics. This work was supported by the Physical Sciences Division of the NOAA Earth System Research Laboratory and by the Mesoscale and Microscale Meteorology Division of NCAR.

## FOR FURTHER READING

## Footnotes

*The National Center for Atmospheric Research is sponsored by the National Science Foundation

^{1} The NSF statistics from 1972–74 are “not strictly comparable with 1975 and later data” because of the inclusion of more fields and more institutions over that period (NSF 1998).

^{2}Because the data for 1998 and 2005 were in summary form, it is *possible* that the people doing the filtering—and hence the process employed to include only “atmospheric”—differ slightly from year to year, and it is *probable* that the filtering process was slightly different from that used by LeMone for the 1992 data.

^{3}The NSF statistics for bachelor's and master's degrees were computed by NSF from data extracted from a different survey than were the statistics for doctoral degrees, which leads to the *possibility* of “atmospheric chemistry and climatology” degrees being included in the latter but not in the former. In addition, there is a data discontinuity in the bachelor's and master's degree statistics, with statistics from 2000 forward based on data drawn from a larger pool of institutions than used for the 1966–99 statistics.

^{a} Reexamination of the data prompted a slight tweaking of the dates as well as the percentages. The year was changed to 1998 after a painstaking reading of the statistical summary in AMS/UCAR (2000), which lists “current” majors “through summer 1999.” However, the university statistics therein were not uniform, with some listing students for the 1997–99 reporting period.

^{b} The year 2004 was changed to 2005 to be consistent with the notation “current majors.”