Table 1.
Global Mass Input From the Four Cosmic Dust Sources for the JFC‐Planck Fita
| Mass Flux | JFC (t d−1) | AST (t d−1) | LPC = HTC (t d−1) | Total (t d−1) | LPC = OCC (t d−1) |
|---|---|---|---|---|---|
| Unmelted micrometeorites | 27.4 | 1.2 | 0.3 | 28.9 | 0.04 |
| Cosmic spherules | 4.4 | 1.8 | 0.3 | 6.5 | 0.06 |
| Ablated atoms | 2.8 | 0.7 | 4.4 | 7.9 | 4.4 |
| Cosmic spherules b | 2.4 | 1.7 | 0.3 | 4.4 | 0.05 |
| Unmelted (∅ > 50 µm) | 3.0 | 1.1 | 0.2 | 4.3 | 0.03 |
| Na | 0.2 (28%) | 0.02 (75%) | 0.09 (99%) | 0.3 (40%) | 0.09 (100%) |
| K | 7.7 × 10−3 (27%) | 2.2 × 10−3 (74%) | 4.0 × 10−3 (97%) | 0.01 (28%) | 3.8 × 10−3 (100%) |
| Fe | 1.0 (10%) | 0.3 (28%) | 1.3 (90%) | 2.6 (21%) | 1.2 (98%) |
| Si | 0.4 (6%) | 0.1 (17%) | 0.7 (87%) | 1.2 (17%) | 0.7 (97%) |
| Mg | 0.3 (5%) | 0.06 (11%) | 0.6 (85%) | 1.0 (16%) | 0.6 (97%) |
| Ca | 7.0 × 10−3 (1%) | 1.8 × 10−4 (0.4%) | 0.05 (70%) | 0.06 (10%) | 0.06 (93%) |
| Al | 3.7 × 10−3 (0.8%) | 5.5 × 10−5 (0.1%) | 0.04 (59%) | 0.04 (7%) | 0.05 (88%) |
| Ti | 3.6 × 10−5 (2%) | 1.7 × 10−6 (0.8%) | 2.5 × 10−4 (84%) | 2.9 × 10−4 (11%) | 3.0 × 10−4 (100%) |
| O | 0.9 (7%) | 0.2 (18%) | 1.6 (90%) | 2.7 (17%) | 1.7 (100%) |
| Total | 34.6 | 3.7 | 5.0 | 43.3 | 4.5 |
| % Na|87.5 km c | 86% | 46% | 99% | 87% | 100% |
| % Fe|87.5 km c | 52% | 0.9% | 92% | 65% | 98% |
a
Elemental ablation inputs are italicized; the percentages in parentheses show the fraction of each element that ablates from its total atmospheric input from each source.
b
Spherules in the size range 50 µm ≤ ∅ ≤ 700 µm corresponding to measurements at South Pole [Taylor et al., 1998].
c
Fraction of Na and Fe ablated above 87.5 km.