## 2 Data Description  
The data provided in Supplementary Materials (Table S1) in spreadsheet format is the summary of biogenic volatiles emitted from four selected cold-hardy grape cultivars during ripening. Each row contains information about the Chemical Abstracts Service (CAS) number, volatile compound name, gas chromatography (GC) retention time in minutes, site location (Iowa or South Dakota), sampling method (whole cluster, single berry, crushed berries), sampling date, relative abundance of the volatile compound (in peak area counts), percent match to mass spectral libraries, and published aroma descriptors from two databases [5; 6], as read from left to right in the spreadsheet. Each row represents data for a single vine, that is, three or four replicates were samples at the same timepoint. Blanks (i.e., ambient air samples collected at each vineyard) were used to account for potential interfering compounds. Small variations in the GC column retention time in Table S1 are typical with manual injection of SPME-based samples. A key is also provided in the sample table footer (Table 1). Data analysis including multivariate analyses of the entire dataset in Table S1 is provided elsewhere [7].  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \multirow{2}{*}{**CAS**} & \multirow{2}{*}{\begin{tabular}{c} **Compound** \\ **Name** \\ \end{tabular} } & \multicolumn{2}{c}{\
\begin{tabular}{c} **GC Column** \\ **Retention Time** \\ **(min)** \\ \end{tabular} } & \multicolumn{2}{c}{**Site Location**} & \multicolumn{2}{c}{**Method of**} & \multirow{2}{*}{**Cultivar**} & \multicolumn{2}{c}{**Date**} & \multicolumn{2}{c}{
\begin{tabular}{c} **De-Convoluted** \\ **Signal (Peak** \\ **Area Count)** \\ \end{tabular} } & \multicolumn{2}{c}{**MS Spectral**} & \multicolumn{2}{c}{**Aroma Descriptor(s)**} \\ \cline{3-10}  & & **(State)** & **(State)** & **(State)** & **(State)** & **(State)** & **(State)** & **(State)** & **(State)** & **(State)** & **(State)** & **(State)** \\ \hline
100-42-5 & Styrene & 11.30 & IA & CB & Frontense & 13-August-2013 & 2.76 \(\times\) 10\({}^{4}\) & 99 &
\begin{tabular}{c} Blasamic, \\ Gasolite \\ \end{tabular} & \multicolumn{2}{c}{Balsamic} \\ \hline
100-51-6 & \
\begin{tabular}{c} Benzyl \\ Alcohol \\ \end{tabular} & 20.46 & IA & CB & St. Crovik & 3-September-2013 & 8.33 \(\times\) 10\({}^{4}\) & 89 &
\begin{tabular}{c} Sweet, \\ Flower \\ \end{tabular} & \multicolumn{2}{c}{Floral} \\ \hline
100-52-7 & Benzaldehyde & 15.34 & IA & CB & La Crescent & 29-August-2013 & 2.11 \(\times\) 10\({}^{5}\) & 97 &
\begin{tabular}{c} Allmed, \\ Burnt sugar \\ \end{tabular} & \multicolumn{2}{c}{Fruity} \\ \hline
106-24-1 & Cerninol & 21.47 & SD & CB & Marquette & 27-August-2012 & 9.02 \(\times\) 10\({}^{4}\) & 85 & \
\begin{tabular}{c} Sweet, \\ Granium \\ \end{tabular} &
\begin{tabular}{c} Frost, \\ Pritty, Rose, \\ Wavy, Citrus \\ \end{tabular} \\ \hline \end{tabular}  
* \({}^{1}\) IA = Iowa, SD = South Dakota; \({}^{2}\) FEV = polyvinyl fluoride film enclosing whole grape cluster on a vine, GV = modified glass vial enclosing a section of single grape berry skin using vacuum, CB = crushed grape berries, References used: [5] = Ravornet, [6] = The Good Sonts Company.  
\end{table}
Table 1: Example of a summary of biogenic volatiles emitted from four cold-hardy grape cultivars during ripening. Complete summary (-4800 rows) is in Table S1 (Supplementary Materials).